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Last Updated :2024/09/20

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Master

Affiliation (Master)

  • Faculty of Engineering　Applied Chemistry　Industrial Organic Chemistry

Affiliation (Master)

  • Faculty of Engineering　Applied Chemistry　Industrial Organic Chemistry

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Profile and Settings

Degree

  • Master of Science (Keio University), January 1991 Doctor of Philosophy (Nagoya University)（Keio University）

Profile and Settings

  • Name (Japanese)

    Ohkuma

  • Name (Kana)

    Takeshi

  • Name

    200901073198867263

Alternate Names

Achievement

Research Interests

  • Dual Catalysis   Unsaturated Carbonyl Compound   Unsaturated Ketone   Combined Metal Catalyst   Asymmetric Cyanation   Allylic Alcohol   Asymmetric Isomerization   Box ligands   Kinetic resolution   Photocyclization   Pd nanoparticles   Cu complexes   不斉水素化   光学活性アルコール   ルテニウム錯体   ケトン   エナンチオ選択性   DPEN   DAIPEN   反応機構   XylBINAP   生理活性物質   触媒活性   単純ケトン類   BINAP   ルテニウム錯体触媒   TolBINAP   DMAPEN   1,4-ジアミン   シアノヒドリン   アルコール   カルボニル選択性   1-テトラロン   PICA   触媒的不斉合成   IPHAN   金属錯体触媒   LiCl   アルデヒド   ヘテロ原子置換ケトン   合成有機化学   有機金属化学   Asymmetric Catalysis (4072)   Organometallic Chemistry (4072)   Synthetic Organic Chemistry (4602)   Organometallic Chemistry   

Research Areas

  • Nanotechnology/Materials / Functional solid-state chemistry
  • Life sciences / Bioorganic chemistry
  • Nanotechnology/Materials / Structural/physical organic chemistry
  • Nanotechnology/Materials / Synthetic organic chemistry

Research Experience

  • 2013/04 - Today 北海道大学（大学院工学研究院 フロンティア化学教育研究センター） センター長（兼任）
  • 2009 - Today 北海道大学 (大学院工学研究院 有機プロセス工学部門） 教授
  • 2016/04 - 2018/03 Hokkaido University Graduate School of Chemical Sciences and Engineering Deen
  • 2012/06 - 2013/03 北海道大学（大学院工学研究院 フロンティア化学教育研究センター） 副センター長（兼任）
  • 2010 - Professor,Professor (Hokkaido University, Faculty of Chemical Process Engineering)
  • 2005 - 2009 同大学教授（大学院工学研究科 有機プロセス工学専攻） 教授
  • 2005 - 2009 Professor,Professor (Hokkaido University, Division of Chemical Process Engineering)
  • 2004 - 2005 北海道大学教授 (大学院工学研究科 分子化学専攻) 教授
  • 2004 - 2005 Professor,Professor (Hokkaido University, Division of Molecular Chemistry)
  • 2002 - 2004 同大学助教授 (物質科学国際研究センター 有機物質合成研究分野) 助教授
  • 2002 - 2004 Associate Professor,Associate Professor (Nagoya University, Research Center for Materials Science)
  • 1996 - 2002 名古屋大学助教授 (大学院理学研究科 物質理学専攻) 助教授
  • 1996 - 2002 Associate Professor,Associate Professor (Nagoya University, Chemistry Department)
  • 1992 - 1996 野依分子触媒プロジェクト研究員 (新技術事業団 (現 科学技術振興機構)) 研究員
  • 1992 - 1996 Researcher,Molecular Catalysis Project Researcher (Japan Science and Technology Agency)
  • 1991 - 1992 博士研究員 (米国スタンフォード大学) 研究員
  • 1991 - 1992 Researcher,Post Doctoral Researcher (Stanford University, USA)
  • 1988 - 1990 特別研究員 (日本学術振興会) 研究員
  • 1988 - 1990 Researcher,Researcher (Japan Society for Promotion of Science)

Education

  •        - 1991  Nagoya University
  •        - 1991  Nagoya University  Graduate School, Division of Natural Science
  •        - 1987  Keio University  Graduate School of Science and Technology
  •        - 1987  Keio University  Graduate School, Division of Science and Engineering
  •        - 1985  Keio University  Faculty of Science and Technology  Department of Chemistry
  •        - 1985  Keio University  Faculty of Science and Engineering

Committee Memberships

  • 2021/03 - Today   Catalysts   Editorial Board Member
  • 2021/02 - Today   Synthetic Organic Chemistry Japan   kanji
  • 2020/04 - Today   Frontier Chemistry Center (Division of Engineering, Hokkaido University)   Responsible Person for NMR equipments
  • 2017/08 - Today   JSPS   Peer Reviewer
  • 2015/04 - Today   NEDO   Peer Reviewer
  • 2013/04 - Today   Frontier Chemistry Center   Director
  • 2021/04 -2024/05   Elsevier: Academic Press   Comprehensive Chirality 2nd Edition Volume Editor
  • 2021/04 -2023/03   Admission Center, Hokkaido University   Member
  • 2020/04 -2023/03   The Society of Synthetic Organic Chemistry, Japan   International Prize Committee for "Ryoji Noyori Prize"
  • 2022/03 -2023/02   Chemical Society of Japan (Hokkaido Branch)   Chairman
  • 2021/04 -2022/03   Chemical Society of Japan   Reviewer
  • 2020/04 -2022/03   Graduate School of Chemical Sciences and Engineering (Hokkaido University)   Student Committee member
  • 2021/02 -2022/02   Chemical Society of Japan (Hokkaido Branch)   Vice Chairman
  • 2020/10 -2021/09   Applied Chemistry Course (Division of Engineering, Hokkaido University)   Placement stuff
  • 2020/04 -2021/03   Graduate School of Chemical Sciences and Engineering (Hokkaido University)   representative

Awards

  • 2022/01 American Chemical Society Citations for Chemical Breakthrough Awards
     Asymmetric Hydrogenation of β-Keto Carboxylic Esters. A Practical Curly Chemical Access to β-Hydroxy Esters in High Enantiomeric Purity, J. Am. Chem. Soc. 1987, 109, 5856-5858. 
    受賞者: R. Noyori;T. Ohkuma;M. Kitamura (Nagoya University);H. Takaya (Institute for Molecular Science);N. Sayo;H. Kumabayashi;S. Akutagawa (Takasago International Corporation).
  • 2018/03 Chemical Society of Japan The 35th Excellent Scholar Award
     Development of Asymmetric Reactions Catalyzed by Ruthenium Complexes with Two Kinds of Ligands 
    受賞者: OHKUMA Takeshi
  • 2014/12 University of Malaya Asian Core Program Lectureship Award
     
    受賞者: OHKUMA Takeshi
  • 2007/06 International Scientist of the Year 2007
  • 2007/03 第３回日本学術振興会賞
  • 2007 International Scientist of the Year 2007
  • 2007 JSPS Prize
  • 2005/06 慶應義塾大学同窓会 研究教育奨励基金による表彰者
     
    受賞者: 大熊 毅
  • 2000/02 有機合成化学協会 エヌ・イー ケムキャット研究企画賞
     
    受賞者: 大熊 毅
  • 1998/02 有機合成化学奨励賞
     
    受賞者: 大熊 毅

Published Papers

  • Kotohiro Nomura, Raffaella Mancuso, Zhengguo Cai, Samuel Dagorne, Moris S. Eisen, Luca Gonsalvi, Martin Kotora, Bun Yeoul Lee, Shaofeng Liu, Luísa Margarida Martins, Takeshi Ohkuma, Armando Pombeiro, Fabio Ragaini, Carl Redshaw, Marc Visseaux, Zongquan Wu, Hiroto Yoshida, Masamichi Ogasawara
    Catalysts 14 (7) 407  2024/06/27 [Not refereed][Invited]
     
    Herein, I would like to provide an overview of this Special Issue, published in the Organic and Polymer Chemistry Section of Catalysis, comprising contributions from 18 of the journal’s Editorial Board Members [...]
  • Taiga Yurino, Zhen Wu, Kazuaki Suzuki, Rino Nitta, Yusuke Sakaguchi, Takeshi Ohkuma
    Organic Letters 26 900 - 905 1523-7060 2024/01/22 [Refereed][Not invited]
  • Taiga Yurino, Ryo Nishihara, Toshihisa Yasuda, Shuangli Yang, Noriyuki Utsumi, Takeaki Katayama, Noriyoshi Arai, Takeshi Ohkuma
    Organic Letters 26 2872 - 2876 2024/01/05 [Refereed][Invited]
  • Tomohiro Ishizaka, Yuji Nakayama, Taichiro Touge, Yamato Yuki, Kazuhiko Matsumura, Taiga Yurino, Takeshi Ohkuma
    Tetrahedron 133705 - 133705 0040-4020 2023/10/14 [Refereed][Invited]
  • Takuya Takashima, Hamdiye Ece, Taiga Yurino, Takeshi Ohkuma
    Organic Letters 25 (25) 6052 - 6056 1523-7060 2023/08/10 [Refereed][Not invited]
  • Taiga Yurino, Takeshi Ohkuma
    Journal of Synthetic Organic Chemistry, Japan 81 (3) 235 - 243 0037-9980 2023/03/01 [Refereed][Invited]
  • Hiroki. Ishikawa, Taiga Yurino, Ryo Komatsu, Ming-Yuan Gao, Noriyoshi Arai, Takeshi Ohkuma
    Organic Letters 25 2355 - 2360 1523-7060 2023/03 [Refereed][Not invited]
  • Taiga Yurino, Takeshi Ohkuma, Hiroyuki Yamashita, Yuanrong Shan, Zhen Wu
    Synlett 33 (17) 1739 - 1744 0936-5214 2022/10 [Refereed][Not invited]
     
    Abstract Potassium alkoxide was found to be a highly active catalyst for the nucleophilic trifluoromethylation of carbonyl compounds. The catalytic system was successfully applied to the reactions of both aldehydes and ketones, affording the corresponding trifluoromethylated products in high yields at low catalyst loadings (0.1–0.01 mol%) in several solvents, such as THF, toluene, and CH2Cl2. In addition, the potassium salt of a Ru(II) complex bearing an (S)-2,2′-bis[bis(3,5-dimethylphenyl)phosphinyl]-1,1′-binaphthalene [(S)-XylBINAP] ligand and two l-threoninate ligands, prepared in situ, catalyzed the enantioselective trifluoromethylation of aromatic aldehydes, although the ee values were not satisfactory (less than 20%).
  • Taiga Yurino, Sunaho Saito, Mizuki Ichihashi, Takeshi Ohkuma
    The Journal of Organic Chemistry 87 2864 - 2872 0022-3263 2022/01 [Refereed]
  • Noriyoshi Arai, Takeshi Ohkuma
    Tetrahedron Letters 88 153588 - 153588 0040-4039 2022/01 [Refereed][Not invited]
  • Taiga Yurino, Yuji Tange, Takeshi Ohkuma
    Bulletin of the Chemical Society of Japan 94 (9) 2155 - 2161 0009-2673 2021/09/15 [Refereed][Not invited]
  • Noriyoshi Arai, Takeshi Ohkuma
    Asymmetric Hydrogenation and Transfer Hydrogenation 55 - 85 2021/04/26
  • Hamdiye Ece, Yuji Tange, Taiga Yurino, Takeshi Ohkuma
    Synlett 32 935 - 939 0936-5214 2021/01/26 [Refereed][Not invited]
     
    Abstract3-Aryloxindole derivatives were synthesized through a Friedel–Crafts-type cyclization. The reaction was catalyzed by a trimethylsilyl tricyanopalladate complex generated in situ from trimethylsilyl cyanide and Pd(OAc)2. Wide varieties of diethyl phosphates derived from N-arylmandelamides were converted almost quantitatively into oxindoles. When N,N-dibenzylamide was used instead of an anilide substrate, a benzo-fused δ-lactam was obtained. An oxindole product was subjected to substitution reactions to afford 3,3-diaryloxindoles with two different aryl groups.
  • Noriyoshi Arai, Takeshi Ohkuma
    The Journal of Organic Chemistry 85 (23) 15717 - 15725 0022-3263 2020/12/04 [Refereed][Not invited]
  • 〔巻頭言〕伝えることの大切さと難しさ
    大熊毅
    有機合成化学協会誌 78 (8) 759 - 759 2020/08 [Not refereed][Invited]
  • Taiga Yurino, Asuka Hachiya, Keisuke Suzuki, Takeshi Ohkuma
    European Journal of Organic Chemistry 2020 (15) 2225 - 2232 1434-193X 2020/04/23 [Refereed][Not invited]
  • Taiga Yurino, Hamdiye Ece, Takeshi Ohkuma
    Asian Journal of Organic Chemistry 9 (4) 557 - 560 2193-5807 2020/04 [Refereed][Invited]
  • Taiga Yurino, Takeshi Ohkuma
    ACS Omega 5 (10) 4719 - 4724 2470-1343 2020/03/17 [Refereed][Invited]
  • Taiga Yurino, Yuji Tange, Ryutaro Tani, Takeshi Ohkuma
    Organic Chemistry Frontiers 7 (11) 1308 - 1313 2020 [Refereed][Not invited]
     

    Both primary and secondary benzylic isonitriles were exclusively produced by the Ag2O-catalysed reaction of benzylic phosphates and trimethylsilyl cyanide without formation of the thermodynamically favoured regioisomers, benzylic nitriles.

  • Noriyoshi Arai, Takeshi Ohkuma
    Tetrahedron Letters 60 (46) 151252 - 151255 0040-4039 2019/11 [Refereed][Not invited]
  • Isomerization–Asymmetric Hydrogenation Sequence Converting Racemic β-Ylidenecycloalkanols into Stereocontrolled β-Substituted Cycloalkanols Using a Ru Catalytic System with Dual Roles
    Noriyoshi Arai, Yuki Okabe, Takeshi Ohkuma
    Advanced Synthesis & Catalysis 361 (24) 5540 - 5547 2019/11 [Refereed][Not invited]
  • Asymmetric Hydrogenation of Mines Catalyzed by Ruthenium Complexes
    Takeshi Ohkuma
    Catalyst 61 (5) 291 - 297 2019/10 [Refereed][Invited]
  • Pd-Catalyzed Allylic Isocycnation: Nucleophilic N-Terminus Substitution of Ambident Cyanide
    Taiga Yurino, Ryutaro Tani, Takeshi Ohkuma
    ACS Catalysis 9 4434 - 4440 2019/04 [Refereed][Not invited]
  • Development of Highly Active Hydrogenation Catalysts
    Takeshi Ohkuma
    Chemistry & Chemical Industry 72 (3) 259 - 261 2019/03 [Refereed][Invited]
  • T. Ohkuma, N. Kurono, N. Arai
    Bulletin of the Chemical Society of Japan 92 (3) 475 - 504 0009-2673 2018/12 [Refereed][Invited]
     
    © 2019 The Chemical Society of Japan. All rights reserved. Two types of chiral Ru(II) complexes, each with two kinds of ligands, have been designed and utilized as catalysts for several asymmetric reactions under appropriate conditions. The first type, the diphosphine/diamineRu(II)-type complexes, were found to catalyze the hydrogenation of a variety of simple and functionalized ketones as well as imino compounds with high activity and enantioselectivity. The double asymmetric hydrogenation of α,β-unsaturated ketones into the chiral saturated alcohols was achieved by using the dual catalyst system, which reversibly forms two catalytic species. The asymmetric isomerization of primary allylic alcohols into the optically active aldehydes with almost perfect enantioselectivity was realized with this type of catalyst. The second type, the amino acid/diphosphineRu(II)-type complexes combined with Li compounds, exhibited excellent catalyst performance in the asymmetric cyanosilylation of aldehydes as well as simple and functionalized ketones. The isolated Ru¢Li bimetallic complexes were suitable for the asymmetric hydrocyanation of aldehydes. This combined system was applicable to the asymmetric conjugate hydrocyanation of α,β-unsaturated ketones and carboxylic acid derivatives, and the Strecker-type reaction of the π-isoelectronic N-alkoxycarbonyl aldimines. This account describes the concept underlying the design of these catalysts, and the catalyst performance in the asymmetric reactions.
  • Asymmetric Hydrogenation of Polysubstituted Aromatic Ketones Catalyzed by the DIPSkewphos/PICA Derivative–Ruthenium(II) Complexes
    N. Utsumi, N. Arai, K. Kawaguchi, T. Katayama, T. Yasuda, K. Murata, T. Ohkuma
    ChmCatChem 10 3955 - 3959 2018/07 [Refereed][Not invited]
  • Takeshi Ohkuma, Nobuhito Kurono, Yusuke Sakaguchi, Kohei Yamauchi, Taiga Yurino
    Advanced Synthesis and Catalysis 360 (7) 1517 - 1522 1615-4169 2018/04/03 [Refereed][Not invited]
     
    Asymmetric cyanosilylation of alkynyl ketones with the catalyst systems consisting of amino acid/2,2′-bis(diphenylphosphino)-1,1′-binaphthyl (BINAP)/ruthenium(II) complex and lithium phenoxide (Ru⋅Li cat.) was studied. The reaction was conducted in tert-butyl methyl ether (TBME) at −78 °C with a substrate-to-catalyst molar ratio (S/C) as high as 2000. A series of simple and functionalized ketones was converted into the alkynyl tertiary cyanohydrin derivatives in up to 99% ee. Appropriate selection of an amino-acid ligand of the catalyst according to the substrate structure was crucially important to achieve high enantioselectivity and a wide scope of substrates. Transformation of the chiral cyanohydrin product into a functionalized lactone was also examined. (Figure presented.).
  • Construction of Unique Heterocyclic Frameworks by Photochemical Reaction of 5- and 6-Membered Heteroaromatics
    N. Arai, T. Ohkuma
    Heterocycles 96 (6) 997 - 1035 2018/03 [Refereed][Invited]
  • Noriyoshi Arai, Takanori Namba, Kei Kawaguchi, Yuki Matsumoto, Takeshi Ohkuma
    Angewandte Chemie - International Edition 57 (5) 1386 - 1389 1521-3773 2018/01/26 [Refereed][Not invited]
     
    The asymmetric hydrogenation of aromatic γ- and δ-keto esters into optically active hydroxy esters or diols under the catalysis of a novel DIPSkewphos/3-AMIQ–RuII complex was studied. Under the optimized conditions (8 atm H2, Ru complex/t-C4H9OK=1:3.5, 25 °C) the γ- and δ-hydroxy esters (including γ-lactones) were obtained quantitatively with 97–99 % ee. When the reaction was conducted under somewhat harsh conditions (20 atm H2, [t-C4H9OK]=50 mm, 40 °C), the 1,4- and 1,5-diols were obtained predominantly with 95–99 % ee. The reactivity of the ester group was notably dependent on the length of the carbon spacer between the two carbonyl moieties of the substrate. The reaction of β- and ϵ-keto esters selectively afforded the hydroxy esters regardless of the reaction conditions. This catalyst system was applied to the enantioselective and regioselective (for one of the two ester groups) hydrogenation of a γ-ϵ-diketo diester into a trihydroxy ester.
  • Chiraltechnology
    OHKUMA Takeshi
    Chemical Engineering Japan 81 (12) 666 - 669 2017/12 [Refereed][Invited]
  • N. Arai, T. Ohkuma
    Chemistry Today 東京化学同人 (12) 18 - 23 0386-961X 2017/12 [Refereed][Invited]
  • N. Arai, T. Ohkuma
    Chemistry Today 東京化学同人 (11) 17 - 21 0386-961X 2017/11 [Refereed][Invited]
  • Noriyoshi Arai, Takeshi Ohkuma
    Journal of Organic Chemistry 82 (14) 7628 - 7636 1520-6904 2017/07/21 [Refereed][Not invited]
     
    Aza-Diels-Alder-type cycloaddition reactions between a range of N-arylimines and functionalized alkenes were effectively catalyzed by the Cr(III)/bipyridine complex under irradiation of blue light, to give the corresponding 1,2,3,4-tetrahydroquinoline derivatives in high yields with excellent diastereoselectivity. Typically, the reaction of benzylideneaniline with 1-vinyl-2-pyrrolidinone proceeded smoothly with a substrate-to-catalyst molar ratio (S/C) of 1000 and completed within 4 h at room temperature (20-25 °C), affording the cycloaddition product in 97% yield.
  • Noriyoshi Arai, Hironori Satoh, Ryo Komatsu, Takeshi Ohkuma
    CHEMISTRY-A EUROPEAN JOURNAL 23 (37) 8806 - 8809 0947-6539 2017/07 [Refereed][Not invited]
     
    Double asymmetric hydrogenation of linear beta,beta-disubstituted alpha,beta-unsaturated ketones catalyzed by the DM-SEGPHOS/DMAPEN/Ru-II complex with t-C4H9OK afforded the gamma-substituted secondary alcohols in high diastereo-and enantioselectivities. Some mechanistic experiments suggested that two different reactive species, type (I) and (II), were reversibly formed in this catalytic system: Type (I) with the diamine ligand DMAPEN enantioselectively hydrogenated the enones into the chiral allylic alcohols, and type (II) without the diamine ligand diastereoselectively hydrogenated the allylic alcohols into the gamma-substituted secondary alcohols. This dual catalysis protocol was successfully applied to the reaction of a variety of aliphatic-and aromatic-substituted enone substrates.
  • Takeshi Ohkuma
    CHEMICAL RECORD 16 (6) 2428 - 2429 1527-8999 2016/12 [Refereed][Invited]
  • Takeshi Ohkuma, Noriyoshi Arai
    CHEMICAL RECORD 16 (6) 2801 - 2819 1527-8999 2016/12 [Refereed][Invited]
     
    Catalytic asymmetric hydrogenation of ketones through the "metal-ligand cooperative mechanism" has been improved in terms of the efficiency, stereoselectivity, and scope of substrates by varying the arrangement of the catalyst structure and reaction conditions. Imino compounds are also smoothly converted to the optically active amines with appropriate catalysts. This type of catalyst exhibits excellent performance on the asymmetric isomerization of primary allylic alcohols into the optically active aldehydes. This personal account describes recent progress on these topics.
  • Noriyoshi Arai, Nozomi Onodera, Takeshi Ohkuma
    TETRAHEDRON LETTERS 57 (37) 4183 - 4186 0040-4039 2016/09 [Refereed][Not invited]
     
    Catalytic chemoselective hydrogenation of organic azides using palladium nanoparticles stabilized by alkyne derivatives was studied. A broad range of aromatic and aliphatic azides were smoothly reduced to the corresponding amines in excellent yields with a quite small amount of the catalyst. Hydrogenation of 3-phenylpropylazide gave 3-phenylpropylamine almost quantitatively with a substrate-to-palladium molar ratio (S/Pd) of 12,900 under 8 atm of H-2. The reaction under 1 atm of H2 also proceeded smoothly with an S/Pd of 1000. Several reduction-sensitive functional groups, such as carbonyl, halide, benzylic OH, and aliphatic nitro were well tolerated under the reaction conditions. (C) 2016 Elsevier Ltd. All rights reserved.
  • Noriyoshi Arai, Takeshi Ohkuma
    JOURNAL OF SYNTHETIC ORGANIC CHEMISTRY JAPAN 74 (4) 360 - 371 0037-9980 2016/04 [Refereed][Invited]
     
    Novel methods for the construction of molecular frameworks were developed by means of photochemical activation of 5-membered heteroaromatics, including furans, thiophenes, thiazoles, and oxazoles. Intramolecular Diels-Alder-type cycloaddition reactions between furan and an unactivated alkene moiety were found to proceed in high yields in the presence of 9,10-dicyanoanthracene under UV irradiation to afford oxabicyclo[2.2.1]heptane derivatives with high stereoselectivity. Photoirradiation onto alpha-arylthiophene derivatives linked with an alkene moiety through a three-atom spacer gave unprecedented cyclobutene-fused perhydrothiapentalene-type compounds in high yields with high stereoselectivity. A photo-ene type cyclization of 2-aryloxazole derivatives linked with an alkene moiety through a three-atom spacer at the 5-position gave a range of functionalized spiro[4.4] cyclic compounds that included cyclopentane, tetrahydrofuran, and pyrrolidine moieties in moderate to high yields with excellent diastereoselectivity.
  • Nobuhito Kurono, Takeshi Ohkuma
    ACS CATALYSIS 6 (2) 989 - 1023 2155-5435 2016/02 [Refereed][Invited]
     
    Catalytic asymmetric cyanations of prochiral unsaturated compounds affording the corresponding nitrile products in high enantiomeric excess (>= 90% in general) are summarized in this review. The nucleophilic cyanide addition onto aldehydes, ketones, and imines is promoted by chiral metal complexes and organocatalysts. Recent progress in asymmetric conjugate cyanation of alpha,beta-unsaturated carbonyl compounds is also discussed. The asymmetric cyanation of unactivated alkenes is catalyzed by chiral transition-metal complexes. Current topics of intramolecular carbocyanation and aminocyanation in addition to the traditional hydrocyanation are reviewed.
  • Noriyoshi Arai, Nozomi Onodera, Atsushi Dekita, Junichi Hori, Takeshi Ohkuma
    TETRAHEDRON LETTERS 56 (25) 3913 - 3915 0040-4039 2015/06 [Refereed][Not invited]
     
    Palladium nanoparticles stabilized by alkyne derivatives catalyzed the hydrogenation of nitroarenes to the aryl amines in homogeneous phase. The reaction of nitrobenzene proceeded smoothly with a substrate-to-palladium molar ratio (S/Pd) of 51,000 under 8 atm of H-2. The reaction under 1 atm of H-2 with an S/Pd of 1030 was completed in 4 h. A series of substituted nitroarenes, including 4-acetyl- and 4-formylnitrobenzenes, were converted to the aryl amines with high chemoselectivity. (C) 2015 Elsevier Ltd. All rights reserved.
  • Asymmetric Hydrogenation of Ketones and Imines Catalyzed by Ru(II) Complexes
    OHKUMA Takeshi
    Pharmacia 51 (4) 295 - 299 2015/04 [Refereed][Not invited]
  • Noriyoshi Arai, Moe Mizota, Takeshi Ohkuma
    ORGANIC LETTERS 17 (1) 86 - 89 1523-7060 2015/01 [Refereed][Not invited]
     
    A novel photocyclization of 2-aryloxazole derivatives linked with an alkene moiety through a three-atom spacer at the 5-position gave a range of functionalized spiro[4.4] cyclic compounds that included cyclopentane, tetrahydrofuran, and pyrrolidine moieties in moderate to high yields with excellent diastereoselectivity.
  • Noriyoshi Arai, Moe Mizota, Takeshi Ohkuma
    HETEROCYCLES 90 (1) 607 - 616 0385-5414 2015/01 [Refereed][Invited]
     
    Photoirradiation of 2-arylthiazoles derivatives linked with an alkene moiety through a three-atom spacer was investigated. The main products were unexpected tetrahydrofuran-fused thiazepine derivatives with concomitant formation of [2+2] cycloaddition products and regioisomeric thiazoles. The product distribution was little influenced by the reaction conditions and substituents of the substrates.
  • Yusuke Sakaguchi, Nobuhito Kurono, Kohei Yamauchi, Takeshi Ohkuma
    ORGANIC LETTERS 16 (3) 808 - 811 1523-7060 2014/02 [Refereed][Not invited]
     
    Asymmetric conjugate hydrocyanation of alpha,beta-unsaturated carboxylic acid derivatives catalyzed by a Ru[(S)phgly](2)[(S)-binap]-CH2OLi system was examined. The N-acylpyrrole gave the best result in terms of reactivity and enantioselectivity. A series of substrates with alkyl or heterosubstituted alkyl groups at the beta-position reacted with a substrate-to-catalyst molar ratio of 200-2000 to afford the beta-cyano products in the range of 88%->99% ee. The mode of enantioselection in the hydrocyanation was proposed.
  • Noriyoshi Arai, Keisuke Sato, Keita Azuma, Takeshi Ohkuma
    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 52 (29) 7500 - 7504 1433-7851 2013/07 [Refereed][Not invited]
  • Noriyoshi Arai, Hironori Satoh, Noriyuki Utsumi, Kunihiko Murata, Kunihiko Tsutsumi, Takeshi Ohkuma
    ORGANIC LETTERS 15 (12) 3030 - 3033 1523-7060 2013/06 [Refereed][Not invited]
     
    Enantioselective hydrogenation of alkynyl ketones catalyzed by Ru(OTf)(TsDPEN)(eta(6)-p-cymene) (TsDPEN = N-(p-toluenesulfonyl)-1,2-diphenylethylenediamine) affords the propargylic alcohols in up to 97% ee. The alkynyl moieties are left intact In most cases. The reaction can be conducted with a substrate-to-catalyst molar ratio as high as 5000 under 10 atm of H-2. The mode of enantioselection is elucidated with the transition state models directed by the CH/pi attractive interaction between the substrate and the catalytic species.
  • Nobuhito Kurono, Taiki Katayama, Takeshi Ohkuma
    BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 86 (5) 577 - 582 0009-2673 2013/05 [Refereed][Not invited]
     
    A diastereomerically mixed complex [Ru{(S)-phgly}(2){(+/-)-biphep}] is readily prepared from achiral diphosphine BIPHEP in two steps. These diastereomers are then separated by silica gel column chromatography. A 61:39 equilibrium mixture of [Ru{(S)-phgly}(2){(S)-biphep}] and [Ru{(S)-phgly}(2){(R)-biphep}] with Li2CO3 is used to catalyze cyano-silylation of benzaldehyde to afford the R cyanated product in 92% ee. The enantioselectivity is just slightly lower than that by using the pure [Ru{(S)-phgly}(2){(S)-biphep}]/Li2CO3 catalyst system of 96%. The high enantioselective ability of the diastereomerically mixed catalyst is revealed through a series of kinetic experiments in which the highly enantioselective [Ru{(S)-phgly}(2){(S)-biphep}]/Li2CO3 system is shown to catalyze the reaction 16.8 times faster than the less selective [Ru{(S)-phgly}(2){(R)-biphep}]/Li2CO3 system, affording the product in 2.6% ee. An equation is derived to approximate the relationship between the diastereomeric ratio of the catalyst and the ee value of the product.
  • Mamoru Miyazawa, Takashi Tokuhashi, Akiyoshi Horibata, Takatoshi Nakamura, Yu Onozaki, Nobuhito Kurono, Hisanori Senboku, Masao Tokuda, Takeshi Ohkuma, Kazuhiko Orito
    JOURNAL OF HETEROCYCLIC CHEMISTRY 50 E48 - E54 0022-152X 2013/02 [Refereed][Not invited]
     
    A variety of alkoxy-substituted benzolactams with a berbine or yohimbane skeleton were prepared from 1-benzyl-1,2,3,4-tetrahydroisoquinolines or 1-benzyl-1,2,3,4-tetrahydro-beta-carbolines by a phosphine-free Pd(II)-catalyzed direct aromatic carbonylation in a Pd(OAc)(2)-Cu(OAc)(2) catalytic system. The site selectivity was compared with that of the carbonylation with Pd(OAc)(2) or Pd(OAc)(2)center dot 2 PPh3, respectively.
  • Noriyoshi Arai, Yu Saruwatari, Kotaro Isobe, Takeshi Ohkuma
    Advanced Synthesis and Catalysis 355 (14-15) 2769 - 2774 1615-4169 2013 [Refereed][Not invited]
     
    The ruthenabicyclic complex RuCl[(R)-daipena][(R)-dm-segphos] with potassium tert-butoxide catalyzes the hydrogenation of 2-alkylquinoxalines and a 3-methyl-2H-1,4-benzoxazine in toluene under 20-100 atm of hydrogen at 40 °C to afford S-configured cyclic amino products in greater than 97% enantiomeric excess {DAIPENA=anion of DAIPEN at the 2-position of an anisyl group, DAIPEN=1,1-di (4-anisyl)-2-isopropyl-1,2-ethylenediamine, DM-SEGPHOS=(4,4′-bi-1,3-benzodioxole)-5,5′-diylbis[di(3,5-xylyl) phosphine]}. The high catalytic activity results in a turnover number as high as 9400. Hydrogenation of the benzoimine heterocycles with the RuCl[(R)-daipena][(R)-segphos]/ potassium tert-butoxide system yields the R-configured products in high enantiomeric excess [SEGPHOS=(4,4′-bi-1,3- benzodioxole)-5,5′-diylbis-(diphenylphosphine)]. The mode of enantioselection is discussed based on transition state models involving six-membered pericyclic structures. © 2013 Wiley-VCH Verlag GmbH& Co. KGaA, Weinheim.
  • T. Ohkuma, N. Arai
    Comprehensive Chirality 5 270 - 300 2012/09 [Refereed][Not invited]
     
    In this chapter asymmetric hydrogenation of ketones by the use of chiral catalysts is described. In the first part, the asymmetric hydrogenation of functionalized ketones including β-keto esters, α-keto esters, and α-alkoxy or amino ketones is discussed mainly in homogeneous catalytic systems. In the second part, we describe the highly stereoselective manner of the reaction with nonfunctionalized (simple) ketones. The final part of this chapter deals with the highly diastereo- and enantioselective hydrogenation accompanied by dynamic kinetic resolution. © 2012 Elsevier Ltd. All rights reserved.
  • Takeshi Ohkuma, Nobuhito Kurono
    SYNLETT 23 (13) 1865 - 1881 0936-5214 2012/08 [Refereed][Not invited]
     
    The combined systems of phenylglycinate/BINAP/Ru(II) complex and Li compounds have been found to act as highly reactive and enantioselective catalysts for cyanosilylation and hydrocyanation of aldehydes, alpha-keto esters, alpha,beta-unsaturated ketones, and N-protected aldimines. In this account, we describe the concept of catalyst design, the catalytic efficiency of the novel combined systems in the asymmetric cyanation, and the proposed reaction pathway based on the spectral analysis data. 1 Introduction 2 Cyanosilylation of Aldehydes and Ketones Catalyzed by LiCl 3 Asymmetric Cyanosilylation of Aldehydes and alpha-Keto Esters 3.1 Design of Chiral Ru-Li Combined Catalyst Systems 3.2 Cyanosilylation of Aldehydes 3.3 Cyanosilylation of alpha-Keto Esters 4 Asymmetric Hydrocyanation of Aldehydes, alpha,beta-Unsaturated Ketones, and Aldimines 4.1 Hydrocyanation of Aldehydes 4.2 Conjugate Cyanation of alpha,beta-Unsaturated Ketones 4.3 Strecker-Type Reaction 5 Mechanistic Considerations for Cyanosilylation of Aldehydes and Ketones 5.1 Achiral Reaction Catalyzed by LiCl 5.2 Asymmetric Reaction with the Chiral Ru-Li Combined Catalyst 6 Conclusion
  • Noriyoshi Arai, Noriyuki Utsumi, Yuki Matsumoto, Kunihiko Murata, Kunihiko Tsutsumi, Takeshi Ohkuma
    ADVANCED SYNTHESIS & CATALYSIS 354 (11-12) 2089 - 2095 1615-4150 2012/08 [Refereed][Not invited]
     
    The new catalyst system of RuBr2[(S,S)-xyl-skewphos][(S,S)-dpen] and potassium tert-butoxide shows high reactivity and enantioselectivity in the hydrogenation of N-arylimines [Xyl-Skewphos=2,4-bis(di-3,5-xylylphosphino)pentane, DPEN=1,2-diphenylethylenediamine]. A range of imines derived from aromatic and heteroaromatic ketones as well as some ferrocenyl and vinylic imines are hydrogenated with a turnover number as high as 18,000 under 10-50 atm of hydrogen to afford the amine products in up to 99% enantiomeric excess. The reaction is applied to the synthesis of a chiral N-arylamine, which is the synthetic intermediate of a biologically active compound. The mode of enantioselection is interpreted by using transition-state models based on the X-ray structure of the Xyl-Skewphos/DPEN-RuBr2 complex.
  • Eri Kumazawa, Takashi Tokuhashi, Akiyoshi Horibata, Nobuhito Kurono, Hisanori Senboku, Masao Tokuda, Takashi Ohkuma, Kazuhiko Orito
    EUROPEAN JOURNAL OF ORGANIC CHEMISTRY 2012 (24) 4622 - 4633 1434-193X 2012/08 [Refereed][Not invited]
     
    The Pd(OAc)2-induced carbonylation of alkoxy-substituted 1-amino-2-phenyltetralins and 1-amino-2-phenylnaphthalenes was examined to provide the benzo[c]phenanthridine ring system. The carbonylation of substrates containing methylenedioxy groups gave oxysanguinarine and oxyavicine. The tetramethoxy derivatives gave O-methyloxyfagaronine. The substrate with a benzyloxy group afforded a known synthetic precursor to the antileukemic alkaloid, fagaronine.
  • 新井則義, 猿渡佑, 磯部孝太郎, 大熊毅
    万有生命科学振興国際交流財団札幌シンポジウム 24th 45  2012/07/07 [Not refereed][Not invited]
  • Masato Uemura, Nobuhito Kurono, Yusuke Sakai, Takeshi Ohkuma
    ADVANCED SYNTHESIS & CATALYSIS 354 (10) 2023 - 2030 1615-4150 2012/07 [Refereed][Not invited]
     
    Enantioselective reactions of simple ketones, a,a- and beta,beta-dialkoxy ketones, and a-alkoxy ketones with trimethylsilyl cyanide catalyzed by the bimetallic systems of amino acid/BINAP/ruthenium(II) complexes and lithium phenoxide have been studied [BINAP=2,2'-bis(diphenylphosphino)-1,1'-binaphthyl]. The Ru(PhGly)2(BINAP)-lithium phenoxide system showed high enantioselectivity for the reaction of acetophenone derivatives to afford the cyanated products in up to 90% ee [PhGly=phenylglycinate]. For the cyanosilylation of dialkoxy ketones and a-alkoxy ketones, the Ru(t-Leu)2(BINAP)-lithium phenoxide system exhibited the best catalyst performance to produce the cyanohydrin derivatives in up to 99% ee and 98% ee, respectively [t-Leu=tert-leucinate]. The excellent catalytic activity resulted in complete conversion in the reaction with a substrate-to-catalyst molar ratio (S/C) of 10,000 in the best cases.
  • Synthesis of a 3-Arylisoquinoline Alkajoid, Decumbenine B.
    Kumazawa E, Tokuhashi T, Horibata A, Kurono N, Senboku H, Tokuda M, Ohkuma T, Orito K
    European Journal of Organic Chemistry 4622 - 4633 2012/07 [Refereed][Not invited]
  • Arai N, Ohkuma T
    Chemical record (New York, N.Y.) 2 12 (2) 284 - 289 1527-8999 2012/04 [Refereed][Not invited]
  • 松村和彦, 新井則義, 堀清人, 齊藤隆夫, 佐用昇, 大熊毅
    日本化学会講演予稿集 92nd (2) 342  0285-7626 2012/03/09 [Not refereed][Not invited]
  • 新井則義, 田中皓一郎, 大熊毅
    日本化学会講演予稿集 92nd (4) 1243  0285-7626 2012/03/09 [Not refereed][Not invited]
  • 内海典之, 新井則義, 松本祐樹, 村田邦彦, 堤邦彦, 大熊毅
    日本化学会講演予稿集 92nd (4) 1463  0285-7626 2012/03/09 [Not refereed][Not invited]
  • 明石真也, 新井則義, 井上勉, 大熊毅
    日本化学会講演予稿集 92nd (4) 1463  0285-7626 2012/03/09 [Not refereed][Not invited]
  • 植村真人, 黒野暢仁, 大熊毅
    日本化学会講演予稿集 92nd (4) 1381  0285-7626 2012/03/09 [Not refereed][Not invited]
  • Noriyoshi Arai, Koichiro Tanaka, Takeshi Ohkuma
    ORGANIC LETTERS 6 14 (6) 1488 - 1491 1523-7060 2012/03 [Refereed][Not invited]
     
    Photoirradiation of alpha-arylthiophene derivatives linked with an alkene moiety through a three-atom spacer gave unprecedented cyclobutene-fused perhydrothiapentalene-type compounds in high yields, but neither [2 + 2] nor [4 + 2] cycloaddition products. The reaction afforded a single diastereomer in many cases. The chemical structure and relative configuration of a typical product were unambiguously determined by X-ray crystallographic analysis.
  • Masato Uemura, Nobuhito Kurono, Takeshi Ohkuma
    ORGANIC LETTERS 14 (3) 882 - 885 1523-7060 2012/02 [Refereed][Not invited]
     
    Enantioselective hydrocyanation of N-benzyloxycarbonyl aldimines catalyzed by a Ru[(S)-phgly](2)[(S)-binap]/C6H5OLi system or a bimetallic complex [Li{Ru[(S)-phgly](2)[(S)-binap]}]Cl affords the amino nitriles in 92-99% ee. The reaction is carried out in tert-C4H9OCH3 with a substrate-to-catalyst molar ratio in the range of 500-5000 at -20 to 0 degrees C. Primary, secondary, and tertiary alkyl imines as well as the aryl and heteroaryl substrates are smoothly cyanated to produce the desired products in high yield.
  • Rika Harada, Naoto Nishida, Shiho Uchiito, Yu Onozaki, Nobuhito Kurono, Hisanori Senboku, Tokuda Masao, Takeshi Ohkuma, Kazuhiko Orito
    EUROPEAN JOURNAL OF ORGANIC CHEMISTRY 2012 (2) 366 - 379 1434-193X 2012/01 [Refereed][Not invited]
     
    Phosphane-free Pd-0-catalyzed intramolecular aromatic amination was studied. o-Halophenethylamines and 3-(o-halophenyl)propylamines were found to be transformed into indolines and quinolines in a catalytic system based on Pd(OAc)(2) and Cu(OAc)(2) in the presence of K2CO3. Application of the method to substrates containing isoquinoline rings - the 1-(o-bromobenzyl)-3,4-dihydroisoquinolines 6, the 1-(o-bromobenzyl)-1,2,3,4-tetrahydroisoquinolines 7, and the 1-(o-bromophenethyl)isoquinolines 9 - provided the indolo[2,1-a] isoquinoline and dibenzo[a,f] quinolizine ring systems 8 and 10. Extension of the method to beta-carbolines (compounds 11, 12, and 17) produced the benz[f] indolo[2,3-a]indolizine-13-ones 15 and the benz[f] indolo[2,3-a] quinolizine 18. The benzo[f] pyrido[3,4-a] indolizine and indolo[f] pyrido[ 3,4-a]indolizin-12-one ring systems 27 and 31 were built in a similar manner. It was also found that under an atmosphere of CO the same catalytic system produced the corresponding benzolactams, the isoquino[2,1-a][2,7] naphthyridine 34 and the indolo[2,3-a] pyrido[g]quinolizin-8-one 36 [(+/-)-dihydronauclefine] in good yields.
  • Nobuhito Kurono, Kentaro Ohtsuga, Masanori Wakabayashi, Tadahiro Kondo, Hirohito Ooka, Takeshi Ohkuma
    JOURNAL OF ORGANIC CHEMISTRY 76 (24) 10312 - 10318 0022-3263 2011/12 [Not refereed][Not invited]
     
    Kinetic resolution of sterically hindered racemic alpha-tert-alkyl-alpha-hydroxy esters is performed by enantiomer-selective carbamoylation with the t-Bu-Box-Cu(II) catalyst (Box = bis(oxazoline)). The reaction with 0.5 equiv of n-C3H7NCO is carried out with a substrate-to-catalyst molar ratio of 500-5000 at -20 to 25 degrees C. The high enantiomer-discrimination ability of the catalyst achieves an excellent stereoselectivity factor (s = k(fast)/k(slow)) of 261 in the best case. A catalytic cycle for this reaction is proposed.
  • Nobuhito Kurono, Kentaro Ohtsuga, Masanori Wakabayashi, Tadahiro Kondo, Hirohito Ooka, Takeshi Ohkuma
    JOURNAL OF ORGANIC CHEMISTRY 24 76 (24) 10312 - 10318 0022-3263 2011/12 [Refereed][Not invited]
     
    Kinetic resolution of sterically hindered racemic alpha-tert-alkyl-alpha-hydroxy esters is performed by enantiomer-selective carbamoylation with the t-Bu-Box-Cu(II) catalyst (Box = bis(oxazoline)). The reaction with 0.5 equiv of n-C3H7NCO is carried out with a substrate-to-catalyst molar ratio of 500-5000 at -20 to 25 degrees C. The high enantiomer-discrimination ability of the catalyst achieves an excellent stereoselectivity factor (s = k(fast)/k(slow)) of 261 in the best case. A catalytic cycle for this reaction is proposed.
  • Masaya Akashi, Noriyoshi Arai, Tsutomu Inoue, Takeshi Ohkuma
    ADVANCED SYNTHESIS & CATALYSIS 353 (11-12) 1955 - 1960 1615-4150 2011/08 [Not refereed][Not invited]
     
    alpha-Substituted chiral ketones that have small steric and electronic differences around the reaction sites are difficult substrates to reduce with high diastereoselectivity. Metal hydride reduction of 2-(4-benzoylmorpholinyl) phenyl ketone and 3-(1-tert-butoxycarbonylpiperidinyl) phenyl ketone using sodium borohydride, zinc borohydride, and potassium tri-sec-butylborohydride as reducing agents affords the syn- and anti-alcohols in a lower than 80:20 ratio. Hydrogenation of these ketones with a catalyst system of RuCl(2)(BIPHEP) (DMEN) and potassium tert-butoxide in 2-propanol results in the syn-alcohols with >= 99:1 selectivity [BIPHEP= 2,2'-bis(diphenylphosphino)biphenyl, DMEN= N,N-dimethylethylenediamine]. The marked difference in the diastereoselectivity suggests that the stereoselection in this hydrogenation is primarily regulated by the structure of the catalyst's reaction field ("catalyst-controlled diastereoselection") but not the internal stereocontrol of the substrates. This chemistry is applied to the asymmetric hydrogenation through dynamic kinetic resolution with a RuCl(2)[(S)-BINAP][(R)-DMAPEN]/potassium tert-butoxide catalyst [BINAP= 2,2'-bis(diphenylphosphino)- 1,1'-binaphthyl, DMAPEN = 2-dimethylamino-1-phenylethylamine]. A series of aryl heterocycloalkyl ketones has been converted to the alcohols in excellent diastereo- and enantioselectivities. The modes of catalyst-controlled diastereoselection and enantioselection are interpreted by using transition-state molecular models. (S,S)-Reboxetine, a selective norepinephrine uptake inhibitor, was synthesized from one of product alcohols.
  • 坂口祐亮, 新居紀之, 黒野暢仁, 大熊毅
    万有生命科学振興国際交流財団札幌シンポジウム 23rd 54  2011/07/02 [Not refereed][Not invited]
  • Kazuhiko Matsumura, Noriyoshi Arai, Kiyoto Hori, Takao Saito, Noboru Sayo, Takeshi Ohkuma
    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 133 (28) 10696 - 10699 0002-7863 2011/07 [Not refereed][Not invited]
     
    A novel ruthenabicyclic complex with base shows excellent catalytic activity in the asymmetric hydrogenation of ketones. The turnover frequency of the hydrogenation of acetophenone reaches about 35 000 min(-1) in the best case, affording 1-phenylethanol in >99% ee. Several aliphatic and base-labile ketones are smoothly converted to the corresponding alcohols in high enantioselectivity. The catalytic cycle for this hydrogenation, in which the ruthenabicyclic structure of the catalyst is maintained, is proposed on the basis of the deuteration experiment and spectroscopic analysis data.
  • 坂口祐亮, 新居紀之, 黒野暢仁, 大熊毅
    日本化学会北海道支部夏季研究発表会講演要旨集 2011 15  2011/07/01 [Not refereed][Not invited]
  • Kazuhiko Matsumura, Noriyoshi Arai, Kiyoto Hori, Takao Saito, Noboru Sayo, Takeshi Ohkuma
    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 133 (28) 10696 - 10699 0002-7863 2011/07 [Refereed][Not invited]
     
    A novel ruthenabicyclic complex with base shows excellent catalytic activity in the asymmetric hydrogenation of ketones. The turnover frequency of the hydrogenation of acetophenone reaches about 35 000 min(-1) in the best case, affording 1-phenylethanol in >99% ee. Several aliphatic and base-labile ketones are smoothly converted to the corresponding alcohols in high enantioselectivity. The catalytic cycle for this hydrogenation, in which the ruthenabicyclic structure of the catalyst is maintained, is proposed on the basis of the deuteration experiment and spectroscopic analysis data.
  • Takeshi Ohkuma, Nobuhito Kurono
    Privileged Chiral Ligands and Catalysts 1 - 53 2011/04/07 [Refereed][Not invited]
  • 新井則義, 明石真也, 杉崎聡, 大岡浩仁, 井上勉, 大熊毅
    日本化学会講演予稿集 91st (4) 1256  0285-7626 2011/03/11 [Not refereed][Not invited]
  • 坂口祐亮, 新居紀之, 黒野暢仁, 大熊毅
    日本化学会講演予稿集 91st (4) 1286  0285-7626 2011/03/11 [Not refereed][Not invited]
  • 新井則義, 大熊毅
    日本化学会講演予稿集 91st (4) 1203  0285-7626 2011/03/11 [Not refereed][Not invited]
  • 黒野暢仁, 吉川達也, 山崎幹緒, 大熊毅
    日本化学会講演予稿集 91st (4) 1286  0285-7626 2011/03/11 [Not refereed][Not invited]
  • Nobuhito Kurono, Tatsuya Yoshikawa, Mikio Yamasaki, Takeshi Ohkuma
    ORGANIC LETTERS 13 (5) 1254 - 1257 1523-7060 2011/03 [Not refereed][Not invited]
     
    Novel bimetallic complexes [Li{Ru[(S)-phgly](2)[(S)-binap]}]X (X = Cl, Br) are readily synthesized by mixing Ru[(S)-phgly](2)[(S)-binap] and LiX. A single-crystal X-ray analysis reveals the structure. These bimetallic complexes efficiently catalyze asymmetric hydrocyanation of aldehydes with a substrate-to-catalyst molar ratio of 500-2000 at -78 to -60 degrees C. A range of aromatic, heteroaromatic, and alpha,beta-unsaturated aldehydes as well as a tert-alkyl aldehyde is converted to the cyanohydrins in high enantiomeric excess (up to 99%).
  • Noriyoshi Arai, Takeshi Ohkuma
    TETRAHEDRON 67 (9) 1617 - 1622 0040-4020 2011/03 [Not refereed][Not invited]
     
    Reaction of O-propargyl salicylaldehyde and related compounds with dialkylamines in the presence of copper(I) iodide gave 4-(alkylamino)-3-methylenechroman derivatives in good yields through the loss of one alkyl group of the dialkylamine. The reaction also worked well by employing 2-amino benzaldehyde derivatives to afford 4-(alkylamino)-3-methylene-1,2,3,4-tetrahydroquinolines. A deuterium-labeling experiment suggested that the a-hydrogen of the dialkylamine was transferred intramolecularly into the terminal methylene. This result indicated the reaction mechanism, which involved the formation of iminium ion between the aldehyde and the dialkylamine followed by ene-type C-C bond formation with inverse electron demand and hydrolysis. (C) 2011 Elsevier Ltd. All rights reserved.
  • Nobuhito Kurono, Tatsuya Yoshikawa, Mikio Yamasaki, Takeshi Ohkuma
    ORGANIC LETTERS 13 (5) 1254 - 1257 1523-7060 2011/03 [Refereed][Not invited]
     
    Novel bimetallic complexes [Li{Ru[(S)-phgly](2)[(S)-binap]}]X (X = Cl, Br) are readily synthesized by mixing Ru[(S)-phgly](2)[(S)-binap] and LiX. A single-crystal X-ray analysis reveals the structure. These bimetallic complexes efficiently catalyze asymmetric hydrocyanation of aldehydes with a substrate-to-catalyst molar ratio of 500-2000 at -78 to -60 degrees C. A range of aromatic, heteroaromatic, and alpha,beta-unsaturated aldehydes as well as a tert-alkyl aldehyde is converted to the cyanohydrins in high enantiomeric excess (up to 99%).
  • Nobuhito Kurono, Noriyuki Nii, Yusuke Sakaguchi, Masato Uemura, Takeshi Ohkuma
    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 50 (24) 5541 - 5544 1433-7851 2011 [Not refereed][Not invited]
  • Nobuhito Kurono, Noriyuki Nii, Yusuke Sakaguchi, Masato Uemura, Takeshi Ohkuma
    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 24 50 (24) 5541 - 5544 1433-7851 2011 [Refereed][Not invited]
  • Noriyoshi Arai, Masaya Akashi, Satoshi Sugizaki, Hirohito Ooka, Tsutomu Inoue, Takeshi Ohkuma
    ORGANIC LETTERS 12 (15) 3380 - 3383 1523-7060 2010/08 [Not refereed][Not invited]
     
    Hydrogenation of 3-quinuclidinone and bicyclo[2.2.2]octan-2-one with a combined catalyst system of RuCl(2)[(S)-binap][(R)-iphan] and t-C(4)H(9)OK in 2-propanol afforded the chiral alcohols in 97-98% ee. 2-Diphenylmethyl-3-quinuclidinone was hydrogenated with the same catalyst to the cis alcohol with perfect diastereo- and enantioselectivity. The reaction of unsymmetrical ketones with a bicyclo[2.2.1] or -[2.2.2] skeleton gave the corresponding alcohols with high stereoselectivity.
  • Noriyoshi Arai, Masaya Akashi, Satoshi Sugizaki, Hirohito Ooka, Tsutomu Inoue, Takeshi Ohkuma
    ORGANIC LETTERS 12 (15) 3380 - 3383 1523-7060 2010/08 [Refereed][Not invited]
     
    Hydrogenation of 3-quinuclidinone and bicyclo[2.2.2]octan-2-one with a combined catalyst system of RuCl(2)[(S)-binap][(R)-iphan] and t-C(4)H(9)OK in 2-propanol afforded the chiral alcohols in 97-98% ee. 2-Diphenylmethyl-3-quinuclidinone was hydrogenated with the same catalyst to the cis alcohol with perfect diastereo- and enantioselectivity. The reaction of unsymmetrical ketones with a bicyclo[2.2.1] or -[2.2.2] skeleton gave the corresponding alcohols with high stereoselectivity.
  • 新井則義, 田中皓一朗, 大熊毅
    万有生命科学振興国際交流財団札幌シンポジウム 22nd 51  2010/07/03 [Not refereed][Not invited]
  • 堤邦彦, 大熊毅, 片山武昭, 内海典之, 村田邦彦, 新井則義, 黒野暢仁
    日本化学会講演予稿集 90th (4) 1221  0285-7626 2010/03/12 [Not refereed][Not invited]
  • 黒野暢仁, 植村真人, 大熊毅
    日本化学会講演予稿集 90th (4) 1221  0285-7626 2010/03/12 [Not refereed][Not invited]
  • 新井則義, 田中皓一朗, 大熊毅
    日本化学会講演予稿集 90th (4) 1281  0285-7626 2010/03/12 [Not refereed][Not invited]
  • 堀順一, 村田邦彦, 菅井俊樹, 篠原久典, 野依良治, 新井則義, 黒野暢仁, 大熊毅
    日本化学会講演予稿集 90th (4) 1350  0285-7626 2010/03/12 [Not refereed][Not invited]
  • 内海典之, 大熊毅, 堤邦彦, 渡辺正人, 村田邦彦, 新井則義, 黒野暢仁
    日本化学会講演予稿集 90th (4) 1215  0285-7626 2010/03/12 [Not refereed][Not invited]
  • Takeshi Ohkuma
    Proceedings of the Japan Academy Series B: Physical and Biological Sciences 86 (3) 202 - 219 0386-2208 2010/03 [Not refereed][Not invited]
     
    Ru complexes with chiral diphosphines and amine-based ligands achieve high catalytic activity and enantioselectivity for the hydrogenation of ketones under neutral to slightly basic conditions. The chiral environment is controllable by changing the combination of these two ligands. A concerted six-membered transition state is proposed to be the origin of the high reactivity. The η6-arene/TsDPEN-Ru and MsDPEN-Cp*Ir catalysts effect the asymmetric reaction under slightly acidic conditions. A variety of chiral secondary alcohols are obtained in high enantiomeric excess. © 2010 The Japan Academy.
  • Nobuhito Kurono, Masato Uemura, Takeshi Ohkuma
    EUROPEAN JOURNAL OF ORGANIC CHEMISTRY 2010 (8) 1455 - 1459 1434-193X 2010/03 [Not refereed][Not invited]
     
    The asymmetric reaction of alpha-keto esters and (CH3)(3)SiCN, catalyzed by a combined system of [Ru{(S)-phgly}(2){(S)-binap}] and C6H5OLi with a substrate-to-catalyst molar ratio (S/C) of 1000 at -60 degrees C, affords silylated cyanohydrins in up to 99 % ee. Cyanosilylation smoothly proceeds with an S/C of 10,000 at -50 degrees C. The use of Xyl-Binap instead of Binap as a ligand provides better enantioselectivity in some cases. A series of aromatic, hetero-aromatic, aliphatic, and alpha,beta-unsaturated keto esters are converted into the desired products.
  • Noriyoshi Arai, Koichiro Tanaka, Takeshi Ohkuma
    TETRAHEDRON LETTERS 51 (9) 1273 - 1275 0040-4039 2010/03 [Not refereed][Not invited]
     
    A photosensitized reaction of furan with a non-activated simple alkene was investigated Intramolecular Diels-Alder-type cycloaddition reactions between furan and a trisubstituted alkene were found 10 proceed in high yield in the presence of 9,10-dicyanoanthracene under UV irradiation to afford oxabicyclo[2 2 1]heptane derivatives in high stereoselectivity when the furan was alkyl substituted. On the other hand, the aryl-substituted furan cyclized via a completely different pathway to give spirocyclic and tricyclic products. (C) 2009 Elsevier Ltd All rights reserved.
  • Takeshi Ohkuma
    PROCEEDINGS OF THE JAPAN ACADEMY SERIES B-PHYSICAL AND BIOLOGICAL SCIENCES 86 (3) 202 - 219 0386-2208 2010/03 [Refereed][Not invited]
     
    Ru complexes with choral diphosphines and amine-based ligands achieve high catalytic activity and enantioselectivity for the hydrogenation of ketones under neutral to slightly basic conditions. The chiral environment is controllable by changing the combination of these two ligands. A concerted six-membered transition state is proposed to be the origin of the high reactivity. The eta(6)-arene/TsDPEN-Ru and MsDPEN Cp*Ir catalysts effect the asymmetric reaction under slightly acidic conditions. A. variety of chiral secondary alcohols are obtained ill high enantiomeric excess.
  • Christian A. Sandoval, Fusheng Bie, Aki Matsuoka, Yoshiki Yamaguchi, Hiroshi Naka, Yuehui Li, Koichi Kato, Noriyuki Utsumi, Kunihiko Tsutsumi, Takeshi Ohkuma, Kunihiko Murata, Ryoji Noyori
    CHEMISTRY-AN ASIAN JOURNAL 5 (4) 806 - 816 1861-4728 2010 [Not refereed][Not invited]
     
    Aromatic ketones are enantioseletively hydrogenated in alcohols containing [RuX{(S,S)-Tsdpen)(eta(6)-p-cymene)] (Tsdpen=TsNCH(C6H5)CH-(C6H3)NH2; X = TfO, Cl) as precatalysts. The corresponding Ru hydride (X = H) acts as a reducing species. The solution structures and complete spectral assignment of these complexes have been determined using 2D NMR (H-1-H-1 DQF-COSY, H-1-C-13 HMQC, HSQC, and H-1-F-19 HOESY). Depending on the nature of the solvents and conditions, the precatalysts exist as a covalently bound complex, tight ion pair of [Ru+(Tsdpen)(cymene)] and X-, solvent-separated ion pair, or discrete free ions. Solvent effects on the NH2 chemical shifts of the Ru complexes and the hydrodynamic radius and volume of the Re and TfO- ions elucidate the process of precatalyst activation for hydrogenation. Most notably, the Ru triflate possessing a high ionizability, substantiated by cyclic voltammetry, exists in alcoholic solvents largely as a solvent-separated ion pair and/or free ions. Accordingly, its diffusion-derived data in CD3OD reflect the independent motion of [Ru+(Tsdpen)(cymene) and TfO-. In CDCl3, the complex largely retains the covalent structure showing similar diffusion data for the cation and anion. The Ru triflate and chloride show similar but distinct solution behavior in various solvents. Conductivity measurements and catalytic behavior demonstrate that both complexes ionize in CH3OH to generate a common [Ru+(Tsdpen)(cymene)] and X-, although the extent is significantly greater for X = TfO-. The activation of [RuX(Tsdpen)(cymene)] during catalytic hydrogenation in alcoholic solvent occurs by simple ionization to generate [Ru+(Tsdpen)(cymene)]. The catalytic activity is thus significantly influenced by the reaction conditions.
  • Noriyuki Utsumi, Kunihiko Tsutsumi, Masahiko Watanabe, Kunihiko Murata, Noriyoshi Arai, Nobuhito Kurono, Takeshi Ohkume
    HETEROCYCLES 80 (1) 141 - 147 0385-5414 2010/01 [Not refereed][Not invited]
     
    Asymmetric hydrogenation of aromatic heterocyclic ketones catalyzed by Cp*Ir(OTf)(Msdpen) (MsDPEN = N-(methanesulfonyl)-1,2-diphenylethylenediamine) affords the heterocyclic alcohols in 93% to >99% ee. The reaction is conducted in a methanolic solution with a substrate-to-catalyst molar ratio of 200-5000 under 15 atm of H-2. The heterocyclic rings of substrates are left intact.
  • Christian A. Sandoval, Fusheng Bie, Aki Matsuoka, Yoshiki Yamaguchi, Hiroshi Naka, Yuehui Li, Koichi Kato, Noriyuki Utsumi, Kunihiko Tsutsumi, Takeshi Ohkuma, Kunihiko Murata, Ryoji Noyori
    CHEMISTRY-AN ASIAN JOURNAL 5 (4) 806 - 816 1861-4728 2010 [Refereed][Not invited]
     
    Aromatic ketones are enantioseletively hydrogenated in alcohols containing [RuX{(S,S)-Tsdpen)(eta(6)-p-cymene)] (Tsdpen=TsNCH(C6H5)CH-(C6H3)NH2; X = TfO, Cl) as precatalysts. The corresponding Ru hydride (X = H) acts as a reducing species. The solution structures and complete spectral assignment of these complexes have been determined using 2D NMR (H-1-H-1 DQF-COSY, H-1-C-13 HMQC, HSQC, and H-1-F-19 HOESY). Depending on the nature of the solvents and conditions, the precatalysts exist as a covalently bound complex, tight ion pair of [Ru+(Tsdpen)(cymene)] and X-, solvent-separated ion pair, or discrete free ions. Solvent effects on the NH2 chemical shifts of the Ru complexes and the hydrodynamic radius and volume of the Re and TfO- ions elucidate the process of precatalyst activation for hydrogenation. Most notably, the Ru triflate possessing a high ionizability, substantiated by cyclic voltammetry, exists in alcoholic solvents largely as a solvent-separated ion pair and/or free ions. Accordingly, its diffusion-derived data in CD3OD reflect the independent motion of [Ru+(Tsdpen)(cymene) and TfO-. In CDCl3, the complex largely retains the covalent structure showing similar diffusion data for the cation and anion. The Ru triflate and chloride show similar but distinct solution behavior in various solvents. Conductivity measurements and catalytic behavior demonstrate that both complexes ionize in CH3OH to generate a common [Ru+(Tsdpen)(cymene)] and X-, although the extent is significantly greater for X = TfO-. The activation of [RuX(Tsdpen)(cymene)] during catalytic hydrogenation in alcoholic solvent occurs by simple ionization to generate [Ru+(Tsdpen)(cymene)]. The catalytic activity is thus significantly influenced by the reaction conditions.
  • OHKUMA TAKESHI
    Catalysts & Catalysis 触媒学会 51 (8) 577 - 582 0559-8958 2009/12/10 [Not refereed][Not invited]
  • OKUMA TAKESHI
    触媒 触媒学会 51 (8) 577-582 - 582 0559-8958 2009/12/10 [Not refereed][Not invited]
  • Junichi Hori, Kunihiko Murata, Toshiki Sugai, Hisanori Shinohara, Ryoji Noyori, Noriyoshi Arai, Nobuhito Kurono, Takeshi Ohkuma
    ADVANCED SYNTHESIS & CATALYSIS 351 (18) 3143 - 3149 1615-4150 2009/12 [Not refereed][Not invited]
     
    Palladium nanoparticles are prepared from palladium(II) acetate and 2 equivalents of potassium tert-butoxide in the presence of 4-octyne. The palladium nanoparticles-tetrabutylammonium borohydride system shows excellent catalytic activity and selectivity in the semihydrogenation of alkynes to the [(Z)-]alkenes. The hydrogenation of 4-octyne is conducted with the catalyst system at a substrate-to-palladium molar ratio of 10,000-200,000 under 8 atm of hydrogen to give (Z)-4-octene in > 99% yield. Isomerization and over-reduction of the Z-alkene are very slow even after consumption of the alkyne.
  • 新井則義, 東慶太, 新居紀之, 大熊毅
    万有生命科学振興国際交流財団札幌シンポジウム 21st 45  2009/07/04 [Not refereed][Not invited]
  • 黒野暢仁, 大津賀健太郎, 若林真徳, 近藤忠弘, 大岡浩仁, 大熊毅
    日本化学会北海道支部夏季研究発表会講演要旨集 2009 8  2009/06/26 [Not refereed][Not invited]
  • 新井則義, 田中皓一朗, 大熊毅
    日本化学会北海道支部夏季研究発表会講演要旨集 2009 20  2009/06/26 [Not refereed][Not invited]
  • 植村真人, 新井健太, 黒野暢仁, 大熊毅
    万有生命科学振興国際交流財団福岡シンポジウム 19th 40  2009/05/23 [Not refereed][Not invited]
  • Kunihiko Tsutsumi, Takeaki Katayama, Noriyuki Utsumi, Kunihiko Murata, Noriyoshi Arai, Nobuhito Kurono, Takeshi Ohkuma
    ORGANIC PROCESS RESEARCH & DEVELOPMENT 13 (3) 625 - 628 1083-6160 2009/05 [Not refereed][Not invited]
     
    Asymmetric hydrogenation of 3-quinuclidinone with RuBr(2)[(S,S)-xylskewphos](pica) in a base containing ethanol affords (R)-3-quinuclidinol in 88-90% ee (XylSkewphos = 2,4-bis(di-3,5-xylylphosphino)pentane, PICA = alpha-picolylamine). The optical purity of the product is readily increased to >99% by recrystallization. The hydrogenation of a 4.3-kg scale with a substrate-to-catalyst molar ratio of 100 000 under 15 atm of H(2) at 30-45 degrees C completes in 4 h. Use of methanol or 2-propanol as a solvent decreases the catalyst efficiency. RuCl(2)(skewphos)(pica), and RuCl(2)(tolbinap)(pica) which have similar structures, are less effective for this reaction.
  • 大熊毅
    有機合成化学講習会テキスト 2009 61-71  2009 [Not refereed][Not invited]
  • Hirohito Ooka, Noriyoshi Arai, Keita Azuma, Nobuhito Kurono, Takeshi Ohkuma
    JOURNAL OF ORGANIC CHEMISTRY 73 (22) 9084 - 9093 0022-3263 2008/11 [Not refereed][Not invited]
     
    Asymmetric hydrogenation of acetophenone in the presence of Ru(II) catalysts coordinated by TolBINAP and a series of chiral 1,2-diamines was studied. The sense and degree of enantioselectivity were highly dependent on the N-substituents of the diamine ligands. The N-substituent effect was discussed in detail. Among these catalysts, the (S)-TolBINAP/(R)DMAPEN-Ru(II) complex showed the highest enantioselectivity. The mode of enantioface selection was interpreted by using transition state models based on the X-ray structure of the catalyst precursor. The chiral catalyst effected the hydrogenation of alkyl aryl ketones and arylglyoxal dialkyl acetals to afford the chiral alcohol in >99% ee in the best cases. Hydrogenation of racemic benzoin methyl ether with the chiral catalyst through dynamic kinetic resolution gave the anti-alcohol (syn:anti = 3:97) in 98% ee, while the reaction of alpha-amidopropiophenones resulted in the syn-alcohols (syn:anti = 96:4 to >99:1) in >98% ee.
  • Hirohito Ooka, Noriyoshi Arai, Keita Azuma, Nobuhito Kurono, Takeshi Ohkuma
    JOURNAL OF ORGANIC CHEMISTRY 73 (22) 9084 - 9093 0022-3263 2008/11 [Refereed][Not invited]
     
    Asymmetric hydrogenation of acetophenone in the presence of Ru(II) catalysts coordinated by TolBINAP and a series of chiral 1,2-diamines was studied. The sense and degree of enantioselectivity were highly dependent on the N-substituents of the diamine ligands. The N-substituent effect was discussed in detail. Among these catalysts, the (S)-TolBINAP/(R)DMAPEN-Ru(II) complex showed the highest enantioselectivity. The mode of enantioface selection was interpreted by using transition state models based on the X-ray structure of the catalyst precursor. The chiral catalyst effected the hydrogenation of alkyl aryl ketones and arylglyoxal dialkyl acetals to afford the chiral alcohol in >99% ee in the best cases. Hydrogenation of racemic benzoin methyl ether with the chiral catalyst through dynamic kinetic resolution gave the anti-alcohol (syn:anti = 3:97) in 98% ee, while the reaction of alpha-amidopropiophenones resulted in the syn-alcohols (syn:anti = 96:4 to >99:1) in >98% ee.
  • 若林真徳, 近藤忠弘, 大岡浩仁, 田地川浩人, 黒野暢仁, 大熊毅
    日本化学会北海道支部研究発表会講演要旨集 2008 34  2008/07/19 [Not refereed][Not invited]
  • 植村真人, 新井健太, 黒野暢仁, 大熊毅
    日本化学会北海道支部研究発表会講演要旨集 2008 33  2008/07/19 [Not refereed][Not invited]
  • 植村真人, 新井健太, 黒野暢仁, 大熊毅
    万有生命科学振興国際交流財団札幌シンポジウム 20th 56  2008/07/05 [Not refereed][Not invited]
  • Noriyoshi Arai, Takeshi Ohkuma
    Modern Reduction Methods 159 - 181 2008/04/04 [Refereed][Not invited]
  • 大熊毅, 内海典之, 渡辺正人, 堤邦彦, 新井則義, 村田邦彦
    日本化学会講演予稿集 88th (2) 1158  0285-7626 2008/03/12 [Not refereed][Not invited]
  • 近藤忠弘, 大岡浩仁, 黒野暢仁, 大熊毅
    日本化学会講演予稿集 88th (2) 1269  0285-7626 2008/03/12 [Not refereed][Not invited]
  • 黒野暢仁, 新井健太, 植村真人, 大熊毅
    日本化学会講演予稿集 88th (2) 1264  0285-7626 2008/03/12 [Not refereed][Not invited]
  • 新井則義, 鈴木賢, 杉崎聡, 反町尋子, 大熊毅
    日本化学会講演予稿集 88th (2) 1108  0285-7626 2008/03/12 [Not refereed][Not invited]
  • 新井則義, 東慶太, 新居紀之, 大熊毅
    日本化学会講演予稿集 88th (2) 1107  0285-7626 2008/03/12 [Not refereed][Not invited]
  • 若林真徳, 近藤忠弘, 大岡浩仁, 田地川浩人, 黒野暢仁, 大熊毅
    日本化学会講演予稿集 88th (2) 1268  0285-7626 2008/03/12 [Not refereed][Not invited]
  • Takeshi Ohkuma, Ryoji Noyori
    The Handbook of Homogeneous Hydrogenation 1105 - 1163 2008/01/31 [Refereed][Not invited]
  • Noriyoshi Arai, Keita Azuma, Noriyuki Nii, Takeshi Ohkuma
    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 47 (39) 7457 - 7460 1433-7851 2008 [Not refereed][Not invited]
  • Nobuhito Kurono, Kenta Arai, Masato Uemura, Takeshi Ohkuma
    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 47 (35) 6643 - 6646 1433-7851 2008 [Not refereed][Not invited]
  • Nobuhito Kurono, Tadahiro Kondo, Masanori Wakabayashi, Hirohito Ooka, Tsutomu Inoue, Hiroto Tachikawa, Takeshi Ohkuma
    CHEMISTRY-AN ASIAN JOURNAL 3 (8-9) 1289 - 1297 1861-4728 2008 [Not refereed][Not invited]
     
    Enantiomer-selective carbamoylation of racemic alpha-hydroxy gamma-lactones with half equivalents of isocyanates in the presence of chiral Cu-II catalysts was studied. Among a series of catalyst bearing chiral bis(oxazoline) (box) and pyridine(bisoxazoline) ligands, [Cu(tBu-box)]X-2 [X=OSO2CF3 (3a), SbF6 (3b)] showed the highest enantioselectivity in the reaction of pantolactone (1a). Use of n-C3H7NCO, a small alkyl isocyanate, in CH2Cl2 solution was important to achieve a high level of enantiomer selection. The tBu-box-Cu-II catalyst efficiently differentiated two enantiomers of beta-substituted alpha-hydroxy gamma-lactones under the optimized reaction conditions, resulting in a stereoselectivity factor (s = k(fast)/k(slow)) of up to 209. Furthermore, this catalyst is highly active, so that the carbamoylation can be conducted with a substrate-to-catalyst molar ratio of 2000-3000. A catalytic cycle of this reaction is also proposed.
  • Noriyoshi Arai, Ken Suzuki, Satoshi Sugizaki, Hiroko Sorimachi, Takeshi Ohkuma
    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 47 (9) 1770 - 1773 1433-7851 2008 [Not refereed][Not invited]
  • 新井則義, 東慶太, 新居紀之, 大熊毅
    有機合成シンポジウム講演要旨集 94th 98-99  2008 [Not refereed][Not invited]
  • 大熊毅
    分子集合体型錯体触媒を用いるケトン類およびイミン類の不斉水素化 平成18−19年度 No.18350046 241P  2008 [Not refereed][Not invited]
  • Noriyoshi Arai, Ken Suzuki, Satoshi Sugizaki, Hiroko Sorimachi, Takeshi Ohkuma
    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 47 (9) 1770 - 1773 1433-7851 2008 [Refereed][Not invited]
  • Nobuhito Kurono, Tadahiro Kondo, Masanori Wakabayashi, Hirohito Ooka, Tsutomu Inoue, Hiroto Tachikawa, Takeshi Ohkuma
    CHEMISTRY-AN ASIAN JOURNAL 3 (8-9) 1289 - 1297 1861-4728 2008 [Refereed][Not invited]
     
    Enantiomer-selective carbamoylation of racemic alpha-hydroxy gamma-lactones with half equivalents of isocyanates in the presence of chiral Cu-II catalysts was studied. Among a series of catalyst bearing chiral bis(oxazoline) (box) and pyridine(bisoxazoline) ligands, [Cu(tBu-box)]X-2 [X=OSO2CF3 (3a), SbF6 (3b)] showed the highest enantioselectivity in the reaction of pantolactone (1a). Use of n-C3H7NCO, a small alkyl isocyanate, in CH2Cl2 solution was important to achieve a high level of enantiomer selection. The tBu-box-Cu-II catalyst efficiently differentiated two enantiomers of beta-substituted alpha-hydroxy gamma-lactones under the optimized reaction conditions, resulting in a stereoselectivity factor (s = k(fast)/k(slow)) of up to 209. Furthermore, this catalyst is highly active, so that the carbamoylation can be conducted with a substrate-to-catalyst molar ratio of 2000-3000. A catalytic cycle of this reaction is also proposed.
  • Nobuhito Kurono, Kenta Arai, Masato Uemura, Takeshi Ohkuma
    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 47 (35) 6643 - 6646 1433-7851 2008 [Refereed][Not invited]
  • Noriyoshi Arai, Keita Azuma, Noriyuki Nii, Takeshi Ohkuma
    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 47 (39) 7457 - 7460 1433-7851 2008 [Refereed][Not invited]
  • Takeshi Ohkuma
    JOURNAL OF SYNTHETIC ORGANIC CHEMISTRY JAPAN 65 (11) 1070 - 1080 0037-9980 2007/11 [Not refereed][Not invited]
     
    Asymmetric hydrogenation of ketones catalyzed by XylBINAP/chiral diamine-Ru(II), TolBINAP/PICA-Ru(II), eta(6)-arene/TsDPEN-Ru(II), and MsDPEN-Cp*lr(III) complexes affords a variety of secondary alcohols with high enantioselectivity. Complete conversion is attainable with a low catalyst loading. The high catalyst efficiency is rationalized by a novel "metal-ligand cooperative mechanism."
  • Yasuhiro Wada, Harumi Kaga, Shiho Uchiito, Eri Kumazawa, Miho Tomiki, Yu Onozaki, Nobuhito Kurono, Masao Tokuda, Takeshi Ohkuma, Kazuhiko Orito
    JOURNAL OF ORGANIC CHEMISTRY 72 (19) 7301 - 7306 0022-3263 2007/09 [Not refereed][Not invited]
     
    [GRAPHICS] For the synthesis of protopine alkaloids, we studied a reaction sequence based on a ring enlargement of indeno[2,1-a][3]benzazepines by a singlet oxygen oxygenation, followed by conversion of an amide carbonyl group of the resultant 10-membered keto-lactam to a methylene group, which is the last step for completion of the synthesis. The key substances, indeno[2,1-a][3]benzazepines, were prepared by Bischler-Napieralski cyclization of alkoxy-substituted 1-(2-bromobenzyl)-3-benzazepin-2-ones. Steric effects of the substituents in this synthesis were examined.
  • Yasuhiro Wada, Harumi Kaga, Shiho Uchiito, Eri Kumazawa, Miho Tomiki, Yu Onozaki, Nobuhito Kurono, Masao Tokuda, Takeshi Ohkuma, Kazuhiko Orito
    JOURNAL OF ORGANIC CHEMISTRY 72 (19) 7301 - 7306 0022-3263 2007/09 [Refereed][Not invited]
     
    [GRAPHICS] For the synthesis of protopine alkaloids, we studied a reaction sequence based on a ring enlargement of indeno[2,1-a][3]benzazepines by a singlet oxygen oxygenation, followed by conversion of an amide carbonyl group of the resultant 10-membered keto-lactam to a methylene group, which is the last step for completion of the synthesis. The key substances, indeno[2,1-a][3]benzazepines, were prepared by Bischler-Napieralski cyclization of alkoxy-substituted 1-(2-bromobenzyl)-3-benzazepin-2-ones. Steric effects of the substituents in this synthesis were examined.
  • 新井則義, 大岡浩仁, 大岡浩仁, 東慶太, 薮内俊夫, 井上勉, 大熊毅
    万有生命科学振興国際交流財団札幌シンポジウム 19th 38  2007/07/07 [Not refereed][Not invited]
  • Takeshi Ohkuma, Noriyuki Utsumi, Masahito Watanabe, Kunihiko Tsutsumi, Noriyoshi Arai, Kunihiko Murata
    ORGANIC LETTERS 9 (13) 2565 - 2567 1523-7060 2007/06 [Not refereed][Not invited]
     
    Asymmetric hydrogenation of a series of alpha-hydroxy aromatic ketones in methanol catalyzed by Cp*Ir(OTf)(MsDPEN) (MsDPEN = N-(methanesulfonyl)-1,2-diphenylethylenediamine) affords the 1-aryl-1,2-ethanediols in up to 99% ee. The reaction can be conducted with a substrate-to-catalyst molar ratio as high as 6000 under 10 atm of H-2. 1-Hydroxy-2-propanone is also hydrogenated with high enantioselectivity.
  • 黒野暢仁, 大熊毅
    化学 62 (6) 66-67  0451-1964 2007/06/01 [Not refereed][Not invited]
  • Takeshi Ohkuma, Noriyuki Utsumi, Masahito Watanabe, Kunihiko Tsutsumi, Noriyoshi Arai, Kunihiko Murata
    ORGANIC LETTERS 9 (13) 2565 - 2567 1523-7060 2007/06 [Refereed][Not invited]
     
    Asymmetric hydrogenation of a series of alpha-hydroxy aromatic ketones in methanol catalyzed by Cp*Ir(OTf)(MsDPEN) (MsDPEN = N-(methanesulfonyl)-1,2-diphenylethylenediamine) affords the 1-aryl-1,2-ethanediols in up to 99% ee. The reaction can be conducted with a substrate-to-catalyst molar ratio as high as 6000 under 10 atm of H-2. 1-Hydroxy-2-propanone is also hydrogenated with high enantioselectivity.
  • 新井則義, 大岡浩仁, 東慶太, 薮内俊夫, 井上勉, 大熊毅
    日本化学会講演予稿集 87th (2) 1002  0285-7626 2007/03/12 [Not refereed][Not invited]
  • 堤邦彦, 大熊毅, 内海典之, 新井則義, 野依良治, 村田邦彦
    日本化学会講演予稿集 87th (2) 1002  0285-7626 2007/03/12 [Not refereed][Not invited]
  • 内海典之, 大熊毅, 堤邦彦, 村田邦彦, SANDOVAL C. A, 野依良治, 野依良治
    日本化学会講演予稿集 87th (2) 1002  0285-7626 2007/03/12 [Not refereed][Not invited]
  • Noriyoshi Arai, Hirohito Ooka, Keita Azuma, Toshio Yabuuchi, Nobuhito Kurono, Tsutomu Inoue, Takeshi Ohkuma
    ORGANIC LETTERS 9 (5) 939 - 941 1523-7060 2007/03 [Not refereed][Not invited]
     
    A catalyst system consisting of RuCl2[(S)-tolbinap][(R)-dmapen] and t-C4H9OK in 2-propanol effects asymmetric hydrogenation of arylglyoxal dialkylacetals to give the alpha-hydroxy acetals in up to 98% ee. Hydrogenation of racemic alpha-amidopropiophenones under dynamic kinetic resolution predominantly gives the syn alcohols in up to 99% ee and > 98% de, while the reaction of racemic bezoin methyl ether gives the anti alcohols in excellent stereoselectivity.
  • Noriyoshi Arai, Hirohito Ooka, Keita Azuma, Toshio Yabuuchi, Nobuhito Kurono, Tsutomu Inoue, Takeshi Ohkuma
    ORGANIC LETTERS 9 (5) 939 - 941 1523-7060 2007/03 [Refereed][Not invited]
     
    A catalyst system consisting of RuCl2[(S)-tolbinap][(R)-dmapen] and t-C4H9OK in 2-propanol effects asymmetric hydrogenation of arylglyoxal dialkylacetals to give the alpha-hydroxy acetals in up to 98% ee. Hydrogenation of racemic alpha-amidopropiophenones under dynamic kinetic resolution predominantly gives the syn alcohols in up to 99% ee and > 98% de, while the reaction of racemic bezoin methyl ether gives the anti alcohols in excellent stereoselectivity.
  • Takeshi Ohkuma, Kunihiko Tsutsumi, Noriyuki Utsumi, Noriyoshi Arai, Ryoji Noyori, Kunihiko Murata
    ORGANIC LETTERS 9 (2) 255 - 257 1523-7060 2007/01 [Not refereed][Not invited]
     
    Asymmetric hydrogenation of various alpha-chloro aromatic ketones with Ru(OTf)(TsDPEN)(eta(6)-arene) (TsDPEN = N-(p-toluenesulfonyl)-1,2-diphenylethylenediamine) produces the chiral chlorohydrins in up to 98% ee. This reaction can be conducted even on a 206-g scale. The hydrogenation of an alpha-chloro ketone with a phenol moiety has been utilized for the synthesis of (R)-norphenylephrine without protection-deprotection operations.
  • Yasuhiro Wada, Naoto Nishida, Nobuhito Kurono, Takashi Ohkuma, Kazuhiko Orito
    European Journal of Organic Chemistry 2007 (26) 4320 - 4327 1434-193X 2007 [Not refereed][Not invited]
     
    The synthesis of a 3-arylisoquinoline alkaloid, decumbenine B, was accomplished in a reaction sequence based on the formation of an indolizine ring (dibenz[a,f]indolizin-5(7H)-one) followed by its cleavage at the amide bond, starting with an interaction of 5,6-(methylenedioxy)isoquinoline with 2-bromo-5,6-(methylenedioxy)benzoyl chloride in the presence of Bu 3SnH. © Wiley-VCH Verlag GmbH & Co. KGaA, 2007.
  • Takeshi Ohkuma, Kunihiko Tsutsumi, Noriyuki Utsumi, Noriyoshi Arai, Ryoji Noyori, Kunihiko Murata
    ORGANIC LETTERS 9 (2) 255 - 257 1523-7060 2007/01 [Refereed][Not invited]
     
    Asymmetric hydrogenation of various alpha-chloro aromatic ketones with Ru(OTf)(TsDPEN)(eta(6)-arene) (TsDPEN = N-(p-toluenesulfonyl)-1,2-diphenylethylenediamine) produces the chiral chlorohydrins in up to 98% ee. This reaction can be conducted even on a 206-g scale. The hydrogenation of an alpha-chloro ketone with a phenol moiety has been utilized for the synthesis of (R)-norphenylephrine without protection-deprotection operations.
  • Takeshi Ohkuma, Noriyuki Utsumi, Kunihiko Tsutsumi, Kunihiko Murata, Christian Sandoval, Ryoji Noyori
    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 128 (27) 8724 - 8725 0002-7863 2006/07 [Not refereed][Not invited]
  • Christian A. Sandoval, Takeshi Ohkuma, Noriyuki Utsumi, Kunihiko Tsutsumi, Kunihiko Murata, Ryoji Noyori
    CHEMISTRY-AN ASIAN JOURNAL 1 (1-2) 102 - 110 1861-4728 2006/07 [Not refereed][Not invited]
     
    Chiral arene-N-tosylethylenediamine-Ru-II complexes can be made to effect both asymmetric transfer hydrogenation and asymmetric hydrogenation of simple ketones through a slight functional modification and by switching reaction conditions. [Ru(OSO2CF3){S,S)-TsNCH(C6H5)CH(C6H5)NH2)(eta(6) -p-cymene)] catalyzes the asymmetric hydrogenation of acetophenone in methanol to afford (S)-1-phenylethanol with 96% ee in 100% yield. Like the transfer hydrogenation catalyzed by similar Ru catalysts with basic 2-propanol or a formic acid/triethylamine mixture, this hydrogenation proceeds through a metal-ligand bifunctional mechanism. The reduction of the C=O function occurs via an intermediary18e RuH species in its outer coordination sphere without metal-substrate interaction. The high catalytic efficiency relies on the facile ionization of the Ru triflate complex in methanol. The turnover rate is dependent on hydrogen pressure and medium acidity and basicity. The RuCl analogue can be used as a precatalyst, albeit less effectively. Unlike the well-known diphosphine-1,2-diamine-Ru-II-catalyzed hydrogenation that proceeds in a basic alcohol, this reaction takes place under slightly acidic conditions, creating new opportunities for asymmetric hydrogenation.
  • Takeshi Ohkuma, Noriyuki Utsumi, Kunihiko Tsutsumi, Kunihiko Murata, Christian Sandoval, Ryoji Noyori
    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 128 (27) 8724 - 8725 0002-7863 2006/07 [Refereed][Not invited]
  • Christian A. Sandoval, Takeshi Ohkuma, Noriyuki Utsumi, Kunihiko Tsutsumi, Kunihiko Murata, Ryoji Noyori
    CHEMISTRY-AN ASIAN JOURNAL 1 (1-2) 102 - 110 1861-4728 2006/07 [Refereed][Not invited]
     
    Chiral arene-N-tosylethylenediamine-Ru-II complexes can be made to effect both asymmetric transfer hydrogenation and asymmetric hydrogenation of simple ketones through a slight functional modification and by switching reaction conditions. [Ru(OSO2CF3){S,S)-TsNCH(C6H5)CH(C6H5)NH2)(eta(6) -p-cymene)] catalyzes the asymmetric hydrogenation of acetophenone in methanol to afford (S)-1-phenylethanol with 96% ee in 100% yield. Like the transfer hydrogenation catalyzed by similar Ru catalysts with basic 2-propanol or a formic acid/triethylamine mixture, this hydrogenation proceeds through a metal-ligand bifunctional mechanism. The reduction of the C=O function occurs via an intermediary18e RuH species in its outer coordination sphere without metal-substrate interaction. The high catalytic efficiency relies on the facile ionization of the Ru triflate complex in methanol. The turnover rate is dependent on hydrogen pressure and medium acidity and basicity. The RuCl analogue can be used as a precatalyst, albeit less effectively. Unlike the well-known diphosphine-1,2-diamine-Ru-II-catalyzed hydrogenation that proceeds in a basic alcohol, this reaction takes place under slightly acidic conditions, creating new opportunities for asymmetric hydrogenation.
  • Takeshi Ohkuma, Masato Kitamura, Ryoji Noyori
    New Frontiers in Asymmetric Catalysis 1 - 32 2006/06/14 [Refereed][Not invited]
  • N Kurono, K Suzuki, T Ohkuma
    LETTERS IN ORGANIC CHEMISTRY 3 (4) 275 - 277 1570-1786 2006/04 [Not refereed][Not invited]
     
    LiCl efficiently catalyzes cyanosilylation of various hetero-substituted ketones. alpha,alpha-Dialkoxy ketones are completely converted to silylated cyanohydrins with a substrate-to-catalyst molar ratio of 100,000 at room temperature. Acctophenones substituted by an electron-attracting group at the ortho or para position show higher reactivity than substrates with an electron-donating function.
  • CA Sandoval, Y Yamaguchi, T Ohkuma, K Kato, R Noyori
    MAGNETIC RESONANCE IN CHEMISTRY 44 (1) 66 - 75 0749-1581 2006/01 [Not refereed][Not invited]
     
    The solution structures of a number of trans-RuH(eta(1)-BH4)[(S)-tolbinap](1,2-diamine) precatalysts [Tol-BINAP = 2,2'-bis(di-4-tolylphosphino)-1,1'-binaphthyl; 1,2-diamine=(S,S)- or (RR)-1,2-diphenylethylene-diamine (DPEN), ethylenediamine (EN), and (S)-1,1-di(4-anisyl)-2-isopropylethylenediamine (DAIPEN)] have been determined using 2D NMR (H-1-H-1 DQF-COSY, H-1-C-13 HMQC, H-1-P-31 HSQC, and H-1-N-15 HSQC), and a double-pulsed field-gradient spin-echo (DPFGSE) NOE technique. All the octahedral Ru complexes adopt a trans configuration with respect to the BH4 and hydride ligands. Amine protons of trans-RuH(eta(1)-BH4)[(S)-tolbinap](1,2-diamine) complexes undergo H/D exchange in (CD3)(2)CDOD. This inherent high acidity, coupled with the lability and chemical properties of the BH4 ligand, allows for precatalyst activation without the need for an added base, in contrast to trans-RuCl2[(S)-tolbinapj(1,2diamine) precatalysts, which require a strong base for generation of a catalytic species. The H/BH4 complex in a 2-propanol solution is converted to catalytically active [trans-RuH((S)-tolbinap)((S,S)-dpen}(ROH)(+) [(RO)(ROH)(n)](-) (R = (CH3)(2)CH), a loosely associated ion pair of the discrete (solvated) cationic fragment and anionic species. Copyright (c) 2006 John Wiley & Sons, Ltd.
  • CA Sandoval, Y Yamaguchi, T Ohkuma, K Kato, R Noyori
    MAGNETIC RESONANCE IN CHEMISTRY 44 (1) 66 - 75 0749-1581 2006/01 [Refereed][Not invited]
     
    The solution structures of a number of trans-RuH(eta(1)-BH4)[(S)-tolbinap](1,2-diamine) precatalysts [Tol-BINAP = 2,2'-bis(di-4-tolylphosphino)-1,1'-binaphthyl; 1,2-diamine=(S,S)- or (RR)-1,2-diphenylethylene-diamine (DPEN), ethylenediamine (EN), and (S)-1,1-di(4-anisyl)-2-isopropylethylenediamine (DAIPEN)] have been determined using 2D NMR (H-1-H-1 DQF-COSY, H-1-C-13 HMQC, H-1-P-31 HSQC, and H-1-N-15 HSQC), and a double-pulsed field-gradient spin-echo (DPFGSE) NOE technique. All the octahedral Ru complexes adopt a trans configuration with respect to the BH4 and hydride ligands. Amine protons of trans-RuH(eta(1)-BH4)[(S)-tolbinap](1,2-diamine) complexes undergo H/D exchange in (CD3)(2)CDOD. This inherent high acidity, coupled with the lability and chemical properties of the BH4 ligand, allows for precatalyst activation without the need for an added base, in contrast to trans-RuCl2[(S)-tolbinapj(1,2diamine) precatalysts, which require a strong base for generation of a catalytic species. The H/BH4 complex in a 2-propanol solution is converted to catalytically active [trans-RuH((S)-tolbinap)((S,S)-dpen}(ROH)(+) [(RO)(ROH)(n)](-) (R = (CH3)(2)CH), a loosely associated ion pair of the discrete (solvated) cationic fragment and anionic species. Copyright (c) 2006 John Wiley & Sons, Ltd.
  • N Kurono, M Yamaguchi, K Suzuki, T Ohkuma
    JOURNAL OF ORGANIC CHEMISTRY 70 (16) 6530 - 6532 0022-3263 2005/08 [Not refereed][Not invited]
     
    LiCl acts as a highly effective catalyst for cyanosilylation of various aldehydes and ketones to the corresponding silylated cyanohydrins. The reaction proceeds smoothly with a substrate/catalyst molar ratio of 100-100 000 at 20-25 degrees C under solvent-free conditions. alpha,beta-Unsaturated aldehydes are completely converted to the 1,2-adducts. The cyanation products can be isolated by direct distillation of the reaction mixture.
  • N Kurono, M Yamaguchi, K Suzuki, T Ohkuma
    JOURNAL OF ORGANIC CHEMISTRY 70 (16) 6530 - 6532 0022-3263 2005/08 [Refereed][Not invited]
     
    LiCl acts as a highly effective catalyst for cyanosilylation of various aldehydes and ketones to the corresponding silylated cyanohydrins. The reaction proceeds smoothly with a substrate/catalyst molar ratio of 100-100 000 at 20-25 degrees C under solvent-free conditions. alpha,beta-Unsaturated aldehydes are completely converted to the 1,2-adducts. The cyanation products can be isolated by direct distillation of the reaction mixture.
  • T Ohkuma, CA Sandoval, R Srinivasan, Q Lin, Y Wei, K Muniz, R Noyori
    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 127 (23) 8288 - 8289 0002-7863 2005/06 [Not refereed][Not invited]
  • T Ohkuma, CA Sandoval, R Srinivasan, Q Lin, Y Wei, K Muniz, R Noyori
    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 127 (23) 8288 - 8289 0002-7863 2005/06 [Refereed][Not invited]
  • R Noyori, CA Sandoval, K Muniz, T Ohkuma
    PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES 363 (1829) 901 - 912 1364-503X 2005/04 [Not refereed][Not invited]
     
    Chiral diphosphine/1,2-diamine-Ru(II) complexes catalyse the rapid, productive and enantioselective hydrogenation of simple ketones. The carbonyl-selective hydrogenation takes place via a non-classical metal-ligand bifunctional mechanism. The reduction of the C=O function occurs in the outer coordination sphere of an 18e transRuH(2)(diphosphine)(diamine) complex without interaction between the unsaturated moiety and the metallic centre. The Ru atom donates a hydride and the NH2 ligand delivers a, proton through a pericyclic six-membered transition state, directly giving an alcoholic product without metal alkoxide formation. The enantiofaces of prochiral ketones are differentiated on the chiral molecular surface of the saturated RuH2 species. This asymmetric catalysis manifests the significance of 'kinetic' supramolecular chemistry.
  • R Noyori, CA Sandoval, K Muniz, T Ohkuma
    PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES 363 (1829) 901 - 912 1364-503X 2005/04 [Refereed][Not invited]
     
    Chiral diphosphine/1,2-diamine-Ru(II) complexes catalyse the rapid, productive and enantioselective hydrogenation of simple ketones. The carbonyl-selective hydrogenation takes place via a non-classical metal-ligand bifunctional mechanism. The reduction of the C=O function occurs in the outer coordination sphere of an 18e transRuH(2)(diphosphine)(diamine) complex without interaction between the unsaturated moiety and the metallic centre. The Ru atom donates a hydride and the NH2 ligand delivers a, proton through a pericyclic six-membered transition state, directly giving an alcoholic product without metal alkoxide formation. The enantiofaces of prochiral ketones are differentiated on the chiral molecular surface of the saturated RuH2 species. This asymmetric catalysis manifests the significance of 'kinetic' supramolecular chemistry.
  • WADA YASUHIRO, TOMIKI MIHO, TOKUDA MASAO, OKUMA TAKESHI, ORITO KAZUHIKO
    日本化学会講演予稿集 85th (2) 937  0285-7626 2005/03/11 [Not refereed][Not invited]
  • WADA YASUHIRO, NISHIDA NAOTO, TOKUDA MASAO, OKUMA TAKESHI, ORITO KAZUHIKO
    日本化学会講演予稿集 85th (2) 937  0285-7626 2005/03/11 [Not refereed][Not invited]
  • KUMAZAWA ERI, TOKUHASHI TAKASHI, HORIBATA AKIYOSHI, OKUMA TSUYOSHI, TOKUDA MASAO, ORITO KAZUHIKO
    複素環化学討論会講演要旨集 34th 229-230  2004/11/01 [Not refereed][Not invited]
  • MIKAMI JUN'YA, HASEGAWA HIKARU, KURONO NOBUHITO, OKUMA TAKESHI, ORITO KAZUHIKO, TOKUDA MASAO
    複素環化学討論会講演要旨集 34th 231-232  2004/11/01 [Not refereed][Not invited]
  • T Ohkuma, T Hattori, H Ooka, T Inoue, R Noyori
    ORGANIC LETTERS 6 (16) 2681 - 2683 1523-7060 2004/08 [Not refereed][Not invited]
     
    A combined system of a RuCl2(binap)(1,4-diamine) complex and t-C4H9OK in i-C3H7OH catalyzes enantioselective hydrogenation of various 1-tetralone derivatives and some methylated 2-cyclohexenones. Hydrogenation of 2-methyl-1-tetralone under dynamic kinetic resolution gives the cis alcohol with high ee.
  • T Ohkuma, T Hattori, H Ooka, T Inoue, R Noyori
    ORGANIC LETTERS 6 (16) 2681 - 2683 1523-7060 2004/08 [Refereed][Not invited]
     
    A combined system of a RuCl2(binap)(1,4-diamine) complex and t-C4H9OK in i-C3H7OH catalyzes enantioselective hydrogenation of various 1-tetralone derivatives and some methylated 2-cyclohexenones. Hydrogenation of 2-methyl-1-tetralone under dynamic kinetic resolution gives the cis alcohol with high ee.
  • T Ohkuma, J Li, R Noyori
    SYNLETT (8) 1383 - 1386 0936-5214 2004/07 [Not refereed][Not invited]
     
    Asymmetric hydrogenation of 2-arylcycloalkanones with trans-RuCl2(binap)(1,2-diamine) and t-C4H9OK in 2-propanol selectively gives the corresponding cis-2-arylcycloalkanois in excellent enantiomeric purity and high yield. Two synthetic intermediates of biologically active compounds have been prepared by this method.
  • R Noyori, M Kitamura, T Ohkuma
    PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 101 (15) 5356 - 5362 0027-8424 2004/04 [Not refereed][Not invited]
     
    Asymmetric hydrogenation uses inexpensive, clean hydrogen gas and a very small amount of a chiral molecular catalyst, providing the most powerful way to produce a wide array of enantio-enriched compounds in a large quantity without forming any waste. The recent revolutionary advances in this field have entirely changed the synthetic approach to producing performance chemicals that require a high degree of structural precision. The means of developing efficient asymmetric hydrogenations is discussed from a mechanistic point of view.
  • R Noyori, M Kitamura, T Ohkuma
    PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 101 (15) 5356 - 5362 0027-8424 2004/04 [Refereed][Not invited]
     
    Asymmetric hydrogenation uses inexpensive, clean hydrogen gas and a very small amount of a chiral molecular catalyst, providing the most powerful way to produce a wide array of enantio-enriched compounds in a large quantity without forming any waste. The recent revolutionary advances in this field have entirely changed the synthetic approach to producing performance chemicals that require a high degree of structural precision. The means of developing efficient asymmetric hydrogenations is discussed from a mechanistic point of view.
  • Takeshi Ohkuma
    未解明生物現象を司る鍵化学物質 平成11−14年度 No.11175101 260-263  2004 [Not refereed][Not invited]
  • 藤沢英仁, 藤原朋也, 竹内義雄, 大熊毅, 野依良治
    フッ素化学討論会講演要旨集 27th 24-25  1880-6201 2003/11/20 [Not refereed][Not invited]
  • CA Sandoval, T Ohkuma, K Muniz, R Noyori
    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 125 (44) 13490 - 13503 0002-7863 2003/11 [Not refereed][Not invited]
     
    Asymmetric hydrogenation of acetophenone with trans-RuH(eta(1)-BH4) [(S)-tolbinap] [(S, S)-dpen] (TolBINAP = 2,2'-bis(di-4-tolylphosphino)-1,1'-binaphthyl; DPEN = 1,2-diphenylethylenediamine) in 2-propanol gives (R)-phenylethanol in 82% ee. The reaction proceeds smoothly even at an atmospheric pressure of H-2 at room temperature and is further accelerated by addition of an alkaline base or a strong organic base. Most importantly, the hydrogenation rate is initially increased to a great extent with an increase in base molarity but subsequently decreases. Without a base, the rate is independent of H-2 pressure in the range of 1-16 atm, while in the presence of a base, the reaction is accelerated with increasing H-2 pressure. The extent of enantioselection is unaffected by hydrogen pressure, the presence or absence of base, the kind of base and coexisting metallic or organic cations, the nature of the solvent, or the substrate concentrations. The reaction with H-2/(CH3)(2)CHOH proceeds 50 times faster than that with D-2/(CD3)(2)CDOD in the absence of base, but the rate differs only by a factor of 2 in the presence of KO-t-C4H9. These findings indicate that dual mechanisms are in operation, both of which are dependent on reaction conditions and involve heterolytic cleavage of H-2 to form a common reactive intermediate. The key [RuH(diphosphine)(diamine)] and its solvate complex have been detected by ESI-TOFMS and NMR spectroscopy. The hydrogenation of ketones is proposed to occur via a nonclassical metal-ligand bifunctional mechanism involving a chiral RuH2(diphosphine)(diamine), where a hydride on Ru and a proton of the NH2 ligand are simultaneously transferred to the C=O function via a six-membered pericyclic transition state. The NH2 unit in the diamine ligand plays a pivotal role in the catalysis. The reaction occurs in the outer coordination sphere of the 18e RuH2 complex without C=O/metal interaction. The enantiofaces of prochiral aromatic ketones are kinetically differentiated on the molecular surface of the coordinatively saturated chiral RuH2 intermediate rather than in a coordinatively unsaturated Ru template.
  • CA Sandoval, T Ohkuma, K Muniz, R Noyori
    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 125 (44) 13490 - 13503 0002-7863 2003/11 [Refereed][Not invited]
     
    Asymmetric hydrogenation of acetophenone with trans-RuH(eta(1)-BH4) [(S)-tolbinap] [(S, S)-dpen] (TolBINAP = 2,2'-bis(di-4-tolylphosphino)-1,1'-binaphthyl; DPEN = 1,2-diphenylethylenediamine) in 2-propanol gives (R)-phenylethanol in 82% ee. The reaction proceeds smoothly even at an atmospheric pressure of H-2 at room temperature and is further accelerated by addition of an alkaline base or a strong organic base. Most importantly, the hydrogenation rate is initially increased to a great extent with an increase in base molarity but subsequently decreases. Without a base, the rate is independent of H-2 pressure in the range of 1-16 atm, while in the presence of a base, the reaction is accelerated with increasing H-2 pressure. The extent of enantioselection is unaffected by hydrogen pressure, the presence or absence of base, the kind of base and coexisting metallic or organic cations, the nature of the solvent, or the substrate concentrations. The reaction with H-2/(CH3)(2)CHOH proceeds 50 times faster than that with D-2/(CD3)(2)CDOD in the absence of base, but the rate differs only by a factor of 2 in the presence of KO-t-C4H9. These findings indicate that dual mechanisms are in operation, both of which are dependent on reaction conditions and involve heterolytic cleavage of H-2 to form a common reactive intermediate. The key [RuH(diphosphine)(diamine)] and its solvate complex have been detected by ESI-TOFMS and NMR spectroscopy. The hydrogenation of ketones is proposed to occur via a nonclassical metal-ligand bifunctional mechanism involving a chiral RuH2(diphosphine)(diamine), where a hydride on Ru and a proton of the NH2 ligand are simultaneously transferred to the C=O function via a six-membered pericyclic transition state. The NH2 unit in the diamine ligand plays a pivotal role in the catalysis. The reaction occurs in the outer coordination sphere of the 18e RuH2 complex without C=O/metal interaction. The enantiofaces of prochiral aromatic ketones are kinetically differentiated on the molecular surface of the coordinatively saturated chiral RuH2 intermediate rather than in a coordinatively unsaturated Ru template.
  • T Ohkuma, M Koizumi, K Muniz, G Hilt, C Kabuto, R Noyori
    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 124 (23) 6508 - 6509 0002-7863 2002/06 [Refereed][Not invited]
  • Ohkuma Takeshi
    tits Japan Science Support Foundation 7 (1) 80 - 81 1342-3363 2002
  • 大熊 毅
    化学工業 化学工業社 52 (12) 951 - 957 0451-2014 2001/12 [Not refereed][Not invited]
  • 大熊毅
    化学工業 化学工業社 52 (12) 951-957 - 979 0451-2014 2001/12/01 [Not refereed][Not invited]
  • 大熊毅
    日本化学会講演予稿集 80th 34  0285-7626 2001/09/07 [Not refereed][Not invited]
  • 大熊 毅
    有機合成化学協会誌 : JOURNAL OF Synthetic Organic Chemistry JAPAN 社団法人 有機合成化学協会 59 (5) 446 - 447 0037-9980 2001/05/01 [Not refereed][Not invited]
  • 大熊毅
    有機合成化学協会誌 The Society of Synthetic Organic Chemistry, Japan 59 (5) 446 - 447 0037-9980 2001/05/01 [Not refereed][Not invited]
  • T Ohkuma, H Takeno, Y Honda, R Noyori
    ADVANCED SYNTHESIS & CATALYSIS 343 (4) 369 - 375 1615-4150 2001/05 [Refereed][Not invited]
     
    The BINAP/1,2-diphenylethylenediamine RuCl2 complexes bound to a polystyrene resin act as precatalysts for asymmetric hydrogenation of various simple ketones. The enantioselectivity, turnover number, and turnover frequency are comparable to those attained under homogeneous conditions.
  • OKUMA TAKESHI, KOIZUMI MASATOSHI, YOSHIDA MAKOTO, NOYORI RYOJI
    日本化学会講演予稿集 79th (2) 1201  0285-7626 2001/03/15 [Not refereed][Not invited]
  • OKUMA TAKESHI, ISHII DAI, TAKENO HIROSHI, NOYORI RYOJI
    日本化学会講演予稿集 79th (2) 1201  0285-7626 2001/03/15 [Not refereed][Not invited]
  • FORMAN G S, OKUMA TAKESHI, HEMS W P, NOYORI RYOJI
    日本化学会講演予稿集 79th (2) 1201  0285-7626 2001/03/15 [Not refereed][Not invited]
  • R Noyori, M Koizumi, D Ishii, T Ohkuma
    PURE AND APPLIED CHEMISTRY 73 (2) 227 - 232 0033-4545 2001/02 [Refereed][Not invited]
     
    RuCl2(phosphine)(2)(1,2-diamine) complexes, coupled with an alkaline base in 2-propanol, allows for preferential hydrogenation of a C=O function over coexisting conjugated or nonconjugated C=C linkages, a nitro group, halogen atoms, and various heterocycles. The functional group selectivity is based on the novel metal-ligand bifunctional mechanism. The use of appropriate chiral diphosphines and diamines results in rapid and productive asymmetric hydrogenation of a range of aromatic, hetero-aromatic, and olefinic ketones. The versatility of this method is manifested by the asymmetric synthesis of various biologically significant chiral compounds.
  • R Noyori, T Ohkuma
    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 40 (1) 40 - 73 1433-7851 2001 [Refereed][Not invited]
  • GS Forman, T Ohkuma, WP Hems, R Noyori
    TETRAHEDRON LETTERS 41 (49) 9471 - 9475 0040-4039 2000/12 [Refereed][Not invited]
     
    A combined system of RuCl2[(R,R)-Me-DuPhos](dmf)(n) and t-C4H9OK catalyzes the asymmetric hydrogenation of alpha -ethylstyrene derivatives. The reaction proceeds with a substrate to catalyst molar ratio of up to 2600 in 2-propanol at 8 atm and room temperature to give the chiral saturated products in 81-89% ee. (C) 2000 Elsevier Science Ltd. All rights reserved.
  • T Ohkuma, D Ishii, H Takeno, R Noyori
    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 122 (27) 6510 - 6511 0002-7863 2000/07 [Refereed][Not invited]
  • T Ohkuma, M Koizumi, M Yoshida, R Noyori
    ORGANIC LETTERS 2 (12) 1749 - 1751 1523-7060 2000/06 [Refereed][Not invited]
     
    [GRAPHICS] trans-RuCL2[(R)-xylbinap][(R)-daipen] or the S,S complex acts as an efficient catalyst for asymmetric hydrogenation of hetero-aromatic ketones. The hydrogenation proceeds with a substrate-to-catalyst molar ratio of 1000-40000 to give chiral alcohols in high ee and high yield. The enantioselectivity appears to be little affected by the properties of the hetero-aromatic ring. This method allows for asymmetric synthesis of duloxetine, an inhibitor of serotonin and norepinephrine uptake carriers.
  • OKUMA TAKESHI, KOIZUMI MASATOSHI, IKEHIRA HIDEYUKI, YOKOZAWA TOORU, NOYORI RYOJI
    日本化学会講演予稿集 78th (2) 1043  0285-7626 2000/03/15 [Not refereed][Not invited]
  • T Ohkuma, M Koizumi, H Ikehira, T Yokozawa, R Noyori
    ORGANIC LETTERS 2 (5) 659 - 662 1523-7060 2000/03 [Refereed][Not invited]
     
    [GRAPHICS] trans-RuCl2[P(C6H4-4-CH3)(3)](2)(NH2CH2CH2NH2) acts as a highly effective precatalyst for the hydrogenation of a variety of benzophenone derivatives to benzhydrols that proceeds smoothly at 8 atm and 23-35 degrees C in 2-propanol containing t-C4H9OK with a substrate/catalyst ratio of 2000-20000. Use of a BINAP/chiral diamine Ru complex effects asymmetric hydrogenation of various ortho-substituted benzophenones and benzoylferrocene to chiral diarylmethanols with consistently high ee.
  • K Mikami, T Korenaga, T Ohkuma, R Noyori
    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 39 (20) 3707 - 3710 1433-7851 2000 [Refereed][Not invited]
  • 大熊毅
    日本化学会講演予稿集 77th 155  0285-7626 1999/09/10 [Not refereed][Not invited]
  • T Ohkuma
    JOURNAL OF SYNTHETIC ORGANIC CHEMISTRY JAPAN 社団法人 有機合成化学協会 57 (8) 667 - 676 0037-9980 1999/08 [Not refereed][Not invited]
     
    Hydrogenation of ketones is amongst one of the most important synthetic reactions. This transformation is not only of academic interest, but also of industrial significance because of its simplicity, environmentally friendliness, and economic viability. trans-RuCl2 (phosphine)(2)(1,2-diamine), when coupled with a strong base in 2-propanol, acts as the most reactive catalyst for homogeneous hydrogenation of ketones. This reaction, unlike conventional hydrogenation, proceeds selectively at a C=O bond leaving coexisting C=C linkages intact. Furthermore, rapid, highly productive asymmetric hydrogenation of simple ketones has been realized by using trans-RuCl2[(S)-tolbinap] [(S, S)-dpen] or its optical antipode. When acetophenone is hydrogenated with the complex, the turnover number reaches 2,400,000 and the turnover frequency as high as 228,000 h(-1) or 63 s(-1). When XylBINAP is used as a chiral phosphine, a wide variety of prochiral ketones are hydrogenated in up to 100% ee. This practical asymmetric hydrogenation will greatly facilitate the synthesis of biologically active compounds and functional materials.
  • R Noyori, T Ohkuma
    PURE AND APPLIED CHEMISTRY 71 (8) 1493 - 1501 0033-4545 1999/08 [Refereed][Not invited]
     
    RuCl2(phosphine)(2)(1,2-diamine) complexes act as excellent precatalysts for homogeneous hydrogenation of simple ketones which lack any functionality capable of interacting with the metallic center. This newly devised catalytic system allows preferential saturation of a C=O function over a coexisting C=C linkage in 2-propanol containing an alkaline base. Furthermore, the stereoselectivity of the reaction is easily controlled by the electronic and steric properties (bulkiness and chirality) of the ligands as well as the reaction conditions.
  • 大熊毅
    万有製薬株式会社札幌シンポジウム要旨集 11th 1-6  1999/07/19 [Not refereed][Not invited]
  • OKUMA TAKESHI
    別冊化学 1999 111-115  0919-2670 1999/05/01 [Not refereed][Not invited]
  • OKUMA TAKESHI, KOIZUMI MASATOSHI, DOUCET H, PHAM T, KOZAWA MASAMI, MURATA KUNIHIKO, KATAYAMA EIJI, YOKOZAWA TOORU, NOYORI RYOJI
    日本化学会講演予稿集 76th (2) 899  0285-7626 1999/03/15 [Not refereed][Not invited]
  • OKUMA TAKESHI, KOIZUMI MASATOSHI, DOUCET H, PHAM T, KOZAWA MASAMI, MURATA KUNIHIKO, KATAYAMA EIJI, YOKOZAWA TOORU, NOYORI RYOJI
    日本化学会講演予稿集 76th (2) 898  0285-7626 1999/03/15 [Not refereed][Not invited]
  • OKUMA TAKESHI
    日本化学会講演予稿集 76th (2) 969  0285-7626 1999/03/15 [Not refereed][Not invited]
  • K Mikami, T Korenaga, M Terada, T Ohkuma, T Pham, R Noyori
    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 38 (4) 495 - 497 1433-7851 1999 [Refereed][Not invited]
  • T Ohkuma, M Koizumi, H Doucet, T Pham, M Kozawa, K Murata, E Katayama, T Yokozawa, T Ikariya, R Noyori
    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 120 (51) 13529 - 13530 0002-7863 1998/12 [Refereed][Not invited]
  • OKUMA TAKESHI
    ファルマシア 34 (11) 1095-1099  0014-8601 1998/11 [Not refereed][Not invited]
  • 大熊 毅
    ファルマシア 公益社団法人日本薬学会 34 (11) 1095 - 1099 0014-8601 1998/11/01 [Not refereed][Not invited]
  • HENRI D, OKUMA TAKESHI, MURATA KUNIHIKO, KOZAWA MASAMI, YOKOZAWA TOORU, KATAYAMA EIJI, IKARIYA TAKAO, NOYORI RYOJI
    日本化学会講演予稿集 74th (2) 1071  0285-7626 1998/03 [Not refereed][Not invited]
  • OKUMA TAKESHI, IKEHIRA HIDEYUKI, IKARIYA TAKAO, NOYORI RYOJI
    日本化学会講演予稿集 74th (2) 1072  0285-7626 1998/03 [Not refereed][Not invited]
  • HENRI D, OKUMA TAKESHI, MURATA KUNIHIKO, KOZAWA MASAMI, YOKOZAWA TOORU, KATAYAMA EIJI, IKARIYA TAKAO, NOYORI RYOJI
    日本化学会講演予稿集 74th (2) 1072  0285-7626 1998/03 [Not refereed][Not invited]
  • OKUMA TAKESHI, HENRI D, PHAM T, NOYORI RYOJI
    日本化学会講演予稿集 74th (2) 1071  0285-7626 1998/03 [Not refereed][Not invited]
  • T Ohkuma, H Doucet, T Pham, K Mikami, T Korenaga, M Terada, R Noyori
    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 120 (5) 1086 - 1087 0002-7863 1998/02 [Refereed][Not invited]
  • T Ohkuma, H Ikehira, T Ikariya, R Noyori
    SYNLETT (5) 467 - + 0936-5214 1997/05 [Refereed][Not invited]
     
    The Ru(II)-BINAP-1,2-diphenylethylenediamine combined catalyst system effects asymmetric hydrogenation of certain cyclic enones in 2-propanol containing KOH with a substrate/catalyst molar ratio of 250 to 2500. The hydrogenation occurs selectively at the C=O function with excellent enantio- or diastereoselectivity.
  • OKUMA TAKESHI, IKEHIRA HIDEYUKI, IKARIYA TAKAO, NOYORI RYOJI
    日本化学会講演予稿集 72nd (2) 809  0285-7626 1997/03 [Not refereed][Not invited]
  • EMURA MAKOTO, HARADA MAKOTO, TOYODA TAKAAKI, YAMAZAKI TETSURO, OKUMA TAKESHI, IKARIYA TAKAO, NOYORI RYOJI
    日本化学会講演予稿集 72nd (2) 970  0285-7626 1997/03 [Not refereed][Not invited]
  • T Ohkuma, R Noyori
    JOURNAL OF SYNTHETIC ORGANIC CHEMISTRY JAPAN 社団法人 有機合成化学協会 54 (7) 553 - 563 0037-9980 1996/07 [Not refereed][Not invited]
     
    Enantioselective reduction of prochiral ketones to optically active secondary alcohols is an important, fundamental subject in synthetic organic chemistry, because the resulting chiral alcohols are versatile building blocks for synthesis of natural or unnatural biological active compounds as well as functional materials. Asymmetric hydrogenation is particularly useful for a large-scale reduction because of the operational simplicity, economical advantage, and environmental consciousness. Enantioselective hydrogenation of simple ketones which have no heteroatoms near carbonyl groups has remained difficult. This review describes the recent development in this area. Certain chiral Ru(II) complexes exhibit an excellent catalytic activity and enantiodifferentiation ability in asymmetric hydrogenation of simple ketones in homogeneous phase.
  • 大熊 毅
    有機合成化学協会誌 社団法人 有機合成化学協会 54 (7) 623 - 623 0037-9980 1996/07/01 [Not refereed][Not invited]
  • OKUMA TAKESHI, OOKA HIROHITO, IKARIYA TAKAO, NOYORI RYOJI
    日本化学会講演予稿集 70th (2) 1310  0285-7626 1996/03 [Not refereed][Not invited]
  • OKUMA TAKESHI, OOKA HIROHITO, IKARIYA TAKAO, NOYORI RYOJI
    日本化学会講演予稿集 70th (2) 1309  0285-7626 1996/03 [Not refereed][Not invited]
  • OKUMA TAKESHI
    日本化学会中国四国支部岡山地区化学講演会講演要旨集 1995 1,2,3,4  1995/11 [Not refereed][Not invited]
  • OKUMA TAKESHI, OOKA HIROHITO, HASHIGUCHI SHOHEI, IKARIYA TAKAO, NOYORI RYOJI
    日本化学会講演予稿集 69th (2) 1149  0285-7626 1995/03 [Not refereed][Not invited]
  • OKUMA TAKESHI, OOKA HIROHITO, HASHIGUCHI SHOHEI, IKARIYA TAKAO, NOYORI RYOJI
    日本化学会講演予稿集 69th (2) 1149  0285-7626 1995/03 [Not refereed][Not invited]
  • OKUMA TAKESHI
    創造科学技術推進事業 1994 創造科学技術研究報告会(東京) 第4部講演要旨集 85-89  1994 [Not refereed][Not invited]
  • T OHKUMA, S HASHIGUCHI, R NOYORI
    JOURNAL OF ORGANIC CHEMISTRY 59 (1) 217 - 221 0022-3263 1994/01 [Refereed][Not invited]
     
    Commercially available lithium hydride, an essentially inert metal hydride, can be activated as a hydride source by an equimolar amount of chlorotrimethylsilane and a catalytic amount of a Zn salt or Zn powder. Aromatic and aliphatic ketones, as well as nonenolizable aldehydes, are reductively converted to the trimethylsilyl ethers of the corresponding alcohols in high yields by treatment with this reagent system in dichloromethane or toluene at 28 to 40 degrees C for 25-50 h. This procedure has many advantages including the safety and low cost of the reagents and operational simplicity and provides a practical method for carbonyl reduction. X-ray induced Auger electron spectroscopy analysis suggests that a Zn(II)I species is the catalyst of the heterogeneous reaction.
  • 北村雅人, 徳永信, 大熊毅, 野依良治
    日本化学会講演予稿集 62nd (2) 611  0285-7626 1991/09 [Not refereed][Not invited]
  • 大熊毅, 北村雅人, 野依良治
    日本化学会講演予稿集 61st (2) 1485  0285-7626 1991/03 [Not refereed][Not invited]
  • T OHKUMA, M KITAMURA, R NOYORI
    TETRAHEDRON LETTERS 31 (38) 5509 - 5512 0040-4039 1990 [Refereed][Not invited]
  • Kitamura M, Ohkuma T, Nishi T, Takaya H, Noyori R
    Symposium on the Chemistry of Natural Products, symposium papers 天然有機化合物討論会 0 (30) 572 - 579 1988/09/26 [Not refereed][Not invited]
     
    Under the influence of the (R)- or (S)-BINAP-based Ru(II) complexes (BINAP =2,2'-bis(diphenylphosphino)-1,1'-binaphthyl), a wide range of functionalized ketones are hydrogenated in a highly enantioselective and predictable manner. The hydrogenation proceeds smoothly in alcoholic media at room temperature with initial hydrogen pressure of 40-100 atm. The substrate to catalyst mole ratio ranges from 230 to 2200. Ru complexes of the type RuX_2(binap) (X = halogen, empirical formula), Ru_2Cl_4(binap)_2N(C_2H_5)_3, or Ru(OCOR)_2(binap) are employable as catalysts, depending on the substrates. Va...
  • 大熊 毅, 野依 良治
    化学 化学同人 43 (7) p480 - 481 0451-1964 1988/07 [Not refereed][Not invited]
  • OHKUMA TAKESHI, NOYORI RYOJI
    化学 43 (7) 480-481  0451-1964 1988/07 [Not refereed][Not invited]
  • Kitamura M., Ohkuma T., Takaya H., Noyori R.
    International Symposium on the Chemistry of Natural Products 天然有機化合物討論会 1988 329 - 329 1988/05/29
  • M KITAMURA, T OHKUMA, H TAKAYA, R NOYORI
    TETRAHEDRON LETTERS 29 (13) 1555 - 1556 0040-4039 1988 [Refereed][Not invited]
  • T NISHI, M KITAMURA, T OHKUMA, R NOYORI
    TETRAHEDRON LETTERS 29 (48) 6327 - 6330 0040-4039 1988 [Refereed][Not invited]
  • K SUZUKI, T OHKUMA, M MIYAZAWA, GI TSUCHIHASHI
    TETRAHEDRON LETTERS 27 (3) 373 - 376 0040-4039 1986 [Refereed][Not invited]
  • K SUZUKI, T OHKUMA, G TSUCHIHASHI
    TETRAHEDRON LETTERS 26 (7) 861 - 864 0040-4039 1985 [Refereed][Not invited]
  • Asymmetric Hydrogenaton of Polysubstituted Aromatic Ketones Catalyzed by the DIPSkewphos/PICA Derivative–Ruthenium(II) Complexes
    N. Utsmi, N. Arai, K. Kawaguchi, T. Katayama, T. Yasuda, K. Murata, T. Ohkuma
    ChemCatChem Publishaed (on Web) [Refereed][Not invited]
  • Synthesis of 8-Oxoberbines and Related Benzolactams by Pd(OAc)2-Catalyzed Direct Aromatic Carbonylation
    M. Miyazawa, T. Tokuhashi, A. Horibata, T. Nakamura, Y. Onozaki, N. Kurono, H. Senboku, M. Tokuda, T. Ohkuma, K. Orito
    [Refereed][Not invited]

MISC

Books etc

  • Takeshi Ohkuma (ContributorIntroduction)
    Elsevier • Academic Press 2024/05 (ISBN: 9780323906449) 1
  • Comprehensive Chirality, 2nd edition, Vol. 7
    Taiga Yurino, Takeshi Ohkuma (ContributorReduction: Asymmetric Hydorgenation and Transfer Hydrogenation of C=O Bonds.)
    Elsevier: Academic Press 2024/05 (ISBN: 9780323906449) 43
  • 有機合成化学協会 (Contributorケトンの高活性不斉水素化触媒を求めて—遷移状態モデルに基づいた試行錯誤—)
    化学同人 2023/07 (ISBN: 9784759823363) xiv, 206p
  • 百合野 大雅, 大熊 毅(有機合成化学協会, 檜山, 為次郎, 野崎, 京子, 中尾, 佳亮, 中野, 幸司 編集) (カルボニル基のシアノ化; アルケン，アルキンのシアノ官能基化; 不斉Strecker反応)
    東京化学同人 2021/11 (ISBN: 9784807920051) x, 212p
  • Noriyoshi Arai, Takeshi Ohkuma (ContributorAsymmetric (Transfer) Hydrogenation of Functionalized Ketones)
    Wiley-VCH 2021/04
  • 新井則義, 大熊 毅 (Joint work12.10.3 水素化・水素移動反応 (https://www.chem-reference.com/viewkiso.php?ID=H120028))
    丸善 2020
  • Atropisomerism and Axial Chirality
    Taiga Kurino, Takeshi Ohkuma (Joint workAxially Chiral P,P-Ligands for Asymmetric Metal-Catalyzed Reactions)
    World Scientific 2019
  • Handbook of Organic Synthesis Experiment
    N. Arai, T. Ohkuma (ContributorReduction with Gaseous Hydrogen)
    Maruzen 2015
  • Comprehensive Chirality, Vol. 5
    Ohkuma T, Arai N (ContributorReduction–Hydrogenation: C=O; Chemoselective.)
    Elsevier 2012
  • Privileged Chiral Ligands and Catalysts
    Ohkuma T, Kurono N (ContributorBINAP)
    Wiley-VCH 2011
  • Science of Synthesis: Stereoselective Synthesis 2
    Arai N, Ohkuma T (ContributorReduction of Carbonyl Compound: Hydrogenation.)
    Thieme 2010
  • 大熊 毅 
    [北海道大学大学院工学研究科] 2008
  • Modern Reduction Methods
    Arai N, Ohkuma T (ContributorCarbonyl Hydroboration.)
    Wiley-VCH 2008
  • New Frontiers in Asymmetric Catalysis
    Ohkuma T, Kitamura M, Noyori R (ContributorLigand Design for Catalytic Asymmetric Reduction.)
    John Wiley & Sons, Inc. 2007
  • The Handbook of Homogeneous Hydrogenation
    Ohkuma T, Noyori R (ContributorEnantioselective Ketone and β-Keto Ester Hydrogenation (Including Mechanisms).)
    Wiley-VCH Verlag GmbH & Co. KGaA 2007
  • 大熊 毅 
    [北海道大学大学院工学研究科] 2005
  • 実力養成化学スクール キラル化学
    丸善 2005
  • Chirality on Organic Chemistry
    Maruzen 2005
  • 化学便覧 基礎編II 第５版
    丸善 2004
  • 実験化学講座 第５版 第１９巻 有機化合物の合成VII
    丸善 2004
  • Comprehensive Asymmetric Catalysis-Supplement 2
    Springer 2004
  • Transition Metals for Organic Synthesis, 2nd Ed
    Wiley-VCH 2004
  • 有機合成のための触媒反応103
    東京化学同人 2004
  • The Fifth Series of Chemistry Handbook
    Marzen 2004
  • The Fifth Series of Experimental Chemistry
    Marzen 2004
  • Catalytic Organic Reactions
    Tokyo Kagaku Dozin 2004
  • 大熊 毅 
    [出版者不明] 2003
  • Comprehensive Asymmetric Catalysis-Supplement 1
    Springer 2003
  • Handbook of Reagints for Organic Synthesis: Chiral Reagents for Asymmetric Synthesis
    John Wiley & Sons, Inc. 2003
  • 大熊 毅 
    [出版者不明] 2001

Presentations

  • Takeshi Ohkuma
    Wender Fest 2024@Tokyo  2024/06
  • Development of Regio- and Stereoselective Reactions Catalyzed by Metal Complexes  [Invited]
    Takeshi Ohkuma
    日産化学株式会社 物質科学研究所 講演会  2023/07
  • Asymmetric Hydrogenation of Simple Ketones  [Invited]
    Takeshi Ohkuma
    Commemorative Symposium on Citation for Chemical Breakthrough  2022/07
  • Catalytic Nucleophilic Isocyanation with Pd and Ad Catalysts  [Invited]
    Takeshi Okuma
    Catalysts Asia-Pacific Academic Forum 2021  2021/07
  • オープニング（オーガナイザー）  [Invited]
    大熊毅
    第３２回札幌万有シンポジウム  2020/12
  • Recent Progress on Asymmetric Hydrogenation with Diphosphine/Diamine–Ru(II) Catalysts  [Invited]
    Takeshi Ohkuma
    2019 Hokkaido University & Peking University Joint Symposium  2019/01
  • Asymmetric Reactions Catalyzed by Chiral Ruthenium Complexes  [Invited]
    Takeshi Ohkuma
    Yamaguchi University IoL Center Colloquium  2018/11
  • Development of Asymmetric Reactions Catalyzed by Chiral Ruthenium Complexes with Two Kinds of Ligands  [Invited]
    Takeshi Ohkuma
    The98th the Chemical Society of Japan Annual Meeting  2018/03
  • Asymmetric Hydrogenation and Isomerization Catalyzed byChiral Ruthenium Complexes  [Invited]
    OHKUMA Takeshi
    The 5th International Symposium on AMBITIOOUS LEASR'S PROGRAM  2017/11
  • Asymmetric Hydrogenation and Isomerization with Chiral Ru(II) Catalysts  [Invited]
    OHKUMA Takeshi
    5th UK-Japanese Symposium on Asymmetric Catalysis  2016/03
  • Enantioselective Cyanation Catalyzed by Ru Complex/Li Compound Combined Systems  [Invited]
    OHKUMA Takeshi
    The 6th Japanese-Sino Symposium on Organic Chemistry for Young Scientists  2015/07
  • Asymmetric Hydrogenation and Isomerization Catalyzed by Ruthenium(II) Complexes  [Invited]
    OHKUMA Takeshi
    8th Singapore International Chemistry Conference 2014  2014/12
  • Enantioselective Hydrogenation and Isomerization with Chiral Ruthenium(II) Catalysts  [Invited]
    OHKUMA Takeshi
    The 9th International Conference on Cutting-Edge Organic Chemistry in Asia  2014/12
  • Asymmetric Hydrogenatin with Ruthenium Complexes  [Invited]
    OHKUMA Takeshi
    日産化学学術講演会  2014/11
  • Asymmetric Hydrogenatin with Molecular Catalysts  [Invited]
    OHKUMA Takeshi
    タワーホール船堀（東京都江戸川区）  2014/10
  • Preface/Opening Remarks  [Invited]
    OHKUMA Takeshi
    Frontier Chemistry Center The 3rd International Symposium "Challenges at the Frontier of Chemical Sciences"  2014/06
  • Preface/Opening Remarks  [Invited]
    OHKUMA Takeshi
    Frontier Chemistry Center The 2nd International Symposium "Advanced Material Science"  2013/12
  • Practical Synthesis of Optically Active Aicohols  [Invited]
    OHKUMA Takeshi
    Inovation Japan 2013  2013/08
  • Kinetic Resolution of α-Hydroxy Esters Catalyzed by Chiral Cu Complexes  [Invited]
    OHKUMA Takeshi
    JST Symposium  2013/03
  • Preface/Opening Remarks  [Invited]
    OHKUMA Takeshi
    Frontier Chemistry Center The 1st International Symposium "Next Generation of Molecular Chemistry"  2013/02
  • Asymmetric Hydrogenation for Practical Synthesis of Chiral Molecules  [Invited]
    OHKUMA Takeshi
    The 4th Symposium on Academic Exchange and Collaborative Research between MRC-ETHZ and FoE-HU (Coorganized by Frontier Chemistry Center of FoE-HU)  2013/02
  • Asymmetric Hydrogenation of Ketones and Imines Catalyzed by Ru(II) Complexes  [Invited]
    OHKUMA Takeshi
    2012 Hokkaido University & Peking University Joint Symposium on Organic and Organometallic Chemistry  2012/07
  • Asymmetric Cyanation Catalyzed by Ru-Li Combined Systems  [Invited]
    OHKUMA Takeshi
    The 5th GCOE International Symposium/The 1st International Symposium of Graduate School of Chemical Sciences and Engineering  2012/02
  • Asymmetric Cyanation Catalyzed by the Chiral Ru-Li Combined Systems  [Invited]
    OHKUMA Takeshi
    大阪大学基礎工学研究科学術講演会  2011/12
  • Asymmetric Cyanosilylation of Aldehydes and α-Keto Esters with the Chiral Ru–Li Combined Catalysts  [Invited]
    OHKUMA Takeshi
    Joint Pre-Symposium on Organometallic Chemistry  2010/07
  • Asymmetric Cyanosilylation of Aldehydes and α-Keto Esters Catalyzed by the Chiral Ru–Li Combined Systems  [Invited]
    OHKUMA Takeshi
    22nd International Symposium on Chirality 2010  2010/07
  • Asymmetric Hydrogenation of Ketones Catalyzed by Chiral Ru(II) Complexes  [Invited]
    OHKUMA Takeshi
    BIT's 1st Annual World Congress of Catalytic Asymmetric Synthesis-2010  2010/05
  • Practcal Synthesis of Optically Active Amino Alcohols  [Invited]
    OHKUMA Takeshi
    ファーマ i ジャパン  2009/07
  • Asymmetric Reduction of Unsaturated Compounds  [Invited]
    OHKUMA Takeshi
    有機合成化学講習会  2009/06
  • Asymmetric Cyanosilylation of Aldehydes with the Chiral Ru–Li Catalyst System  [Invited]
    OHKUMA Takeshi
    The 4th Hokkaido University–Nanjing University Joint Symposium  2008/12
  • Asymmetric Cyanosilylation of Aldehydes with Chiral Ruthenium Catalysts  [Invited]
    OHKUMA Takeshi
    Taiwan-Japan International Symposium on Organic Chemistry and Molecular Science  2008/04
  • Tailor-made触媒を用いるケトン類の不斉水素化  [Invited]
    大熊 毅
    近畿化学協会有機金属部会平成１９年度第３回例会  2007/11
  • Tailor-made触媒によるケトン類の不斉水素化  [Invited]
    大熊 毅
    2007年度 大塚有機合成シンポジウム  2007/10
  • Asymmetric Hydrogenation of Ketones Catalyzed by Tailor-made Ruthenium(II) Complexes  [Invited]
    OHKUMA Takeshi
    2nd International Conference on Cutting-Edge Organic Chemistry in Asia  2007/09
  • Asymmetric Hydrogenation of Ketones Catalyzed by Tailot-made Ru complexes  [Invited]
    OHKUMA Takeshi
    The 16th Symposium on Optically Active Compounds  2006/10
  • Asymmetric Hydrogenation of tert-Alkyl Ketones and 1-Tetralones  [Invited]
    OHKUMA Takeshi
    The 2005 International Chemical Congress of Pacific Basin Societies  2005/12
  • Asymmetric Hydrogenation of Ketones -Design of Chiral Catalysts-  [Invited]
    OHKUMA Takeshi
    The 15th International Symposium on Fine Chemistry and Functional Polymer (FCFPXIV-2005) & IUPAC 1st International Symposium on Novel Materials and Synthesis (NM-1)  2005/10
  • ルテニウム錯体触媒を用いるケトン類の不斉水素化  [Invited]
    大熊 毅
    第４５回オーロラセミナー第２回規則性多孔体研究会合同セミナー  2005/07
  • ケトン類の不斉水素化ー分子世界の左と右ー  [Invited]
    大熊 毅
    慶應義塾大学理工学部同窓会研究・教育奨励基金による特別講演会  2005/06
  • ケトン類の不斉水素化ー分子触媒を用いるアプローチー  [Invited]
    大熊 毅
    第１回生体触媒化学若手講演会  2005/03  横浜
  • Asymmetric Hydrogenation of Simple Ketones  [Invited]
    OHKUMA Takeshi
    第１５回北海道大学触媒化学研究センター研究討論会  2004/11
  • Asymmetric Hydrogenation of Simple Ketones Catalyzed by Ruthenium Complexes  [Invited]
    OHKUMA Takeshi
    The 14th International Symposium on Fine Chemistry and Functional Polymer (FCFP XIV-2004)  2004/08
  • 新規ルテニウムヒドリド錯体触媒を用いるケトン類の不斉水素化  [Invited]
    大熊 毅
    第３７回有機金属若手の会 夏の学校  2004/07
  • Asymmetric Hydrogenation of Ketones with Chiral Ru Complexes  [Invited]
    OHKUMA Takeshi
    北海道大学大学院工学研究科 学術講演会  2004/03
  • Asymmetric Hydrogenation of Ketones  [Invited]
    OHKUMA Takeshi
    日本化学会創立125周年記念 第15回名古屋コンファレンス「産官学連携と化学」  2003/12
  • Development of Efficient Molecular Catalysts  [Invited]
    OHKUMA Takeshi
    21世紀COE形成プログラム「分子機能の解明と創造」：第１回成果報告会  2003/06

Association Memberships

  • 有機合成化学協会   日本化学会   アメリカ化学会   The Society of Synthetic Organic Chemistry, Japan   The Chemical Society of Japan   American Chemical Society   

Works

  • Published paper was introduced on the Organic Chemistry Portal https://www.organic-chemistry.org/abstracts/lit7/974.shtm
    H. Ece, Y. Tange, T. Yurino, T. Ohkuma 2022/04 - Today
  • Citations for Chemical Breakthrough Awards (2021) (American Chemical Society)
    R. Noyori, T. Ohkuma, M. Kitamura, Nagoya University, H. Takaya, Molecular Science, N. Sayo, H. Kumabayashi, S. Akutagawa, Takasago International Corperation 2022/01 - Today
  • Topic Information
    関東化学株式会社 2021/04 - Today
  • 新聞掲載（複数社）される「アジアで初の米国化学会「歴史的化学論文大賞」を受賞」
    R. Noyori, T. Ohkuma, M. Kitamura, Nagoya University, H. Takaya, Molecular Science, N. Sayo, H. Kumabayashi, S. Akutagawa, Takasago International Corperation 2022/01 -2022/01
  • 2020/06 -2020/06
  • Commercialization of Catalysts for Asymmetric Hydrogenation: s-PICA
    Takeshi Ohkuma 2019/12
  • 北海道大学研究シーズ集Vol. 4 (2017) 掲載「均一系パラジウムナノ粒子触媒による水素化反応 —シスアルケンとアミン類の選択的合成—」 ナノテク・材料分野 p100
    大熊 毅 2017
  • 不斉シアノ化触媒市販開始（日本曹達・関東化学）カタログ作成「—不斉シアノ化触媒—Catalyst for Asymmetric Hydrocyanaiton Asymmetric Cyanosilylation」
    大熊 毅 2017
  • The Chemical Recordの”Special Issue Dedicted to Professor Ryoji Noyori on the 15th Anniversary of His Nobel Prize in Chemistry”でGuest Editorを務めた
    大熊 毅 2016/12
  • 北海道大学研究シーズ集Vol. 3 (2016) 掲載「アリルアルコール類の不斉異性化反応 —光学活性β-置換アルデヒド類の高純度合成法—」 ナノテク・材料分野 p99
    大熊 毅 2016
  • 北海道大学研究シーズ集Vol. 2 (2015) 掲載「カルボニル化合物、イミン類の不斉シアノ化反応 —ルテニウム・リチウム複合錯体触媒による多様な光学活性シアン化物の合成—」
    大熊 毅 2015/06
  • CSJ Journal Selects Vol. 2 掲載“Preparation of Diastereomerically Pure and Mixed (S)-PhGly/BIPHEP/Ru(II) Complexes and Their Catalytic Behavior with Li2O3 in Asymmetric Cyanosilylation of Benzaldehyde” Asymmetric Catalysis 分野 p5
    大熊 毅 2015
  • Symposium Organizer "Frontier Chemistry Center The 3rd International Symposium" "Challenges at the Frontier of Chemical Sciences"
    OHKUMA Takeshi 2014/06
  • 北海道大学研究シーズ集2014掲載「ケトン類・イミン類の不斉水素化反応 —ルテニウム錯体触媒による光学活性アルコール類・アミン類の実用的合成法—」
    大熊 毅 2014/05
  • 学術雑誌に記事掲載 Editer’s Eye「光学活性アルデヒドの効率的な合成触媒を開発」「ファルマシア」
    大熊 毅 2013/12
  • 新聞記事掲載「みんなでサイエンス 同じ分子に異なる性質？ 作り分けの技術を開発」「北海道新聞」
    大熊 毅 2013/12
  • Symposium Organizer "Frontier Chemistry Center The 2nd International Symposium" "Advanced Materials Science"
    OHKUMA Takeshi 2013/12
  • 新聞記事掲載「受託製造ビジネス拡大 独自の触媒と配位子活用」「化学工業日報」
    大熊 毅 2013/11
  • 新聞記事掲載「アルデヒド、１回で合成 北海道大 新触媒で純度９９％超」「日経産業新聞」
    大熊 毅 2013/07
  • 発表論文が雑誌内表紙にハイライトされる
    大熊 毅 2013/06
  • Symposium Organizer "Frontier Chemistry Center The 1st International Symposium" "Next Generation of Molecular Chemistry"
    OHKUMA Takeshi 2013/02
  • Symposium Organizer "2012 Hokkaido University & Peking University Joint Symposium on Organic and Organometallic Chemistry"
    OHKUMA Takeshi 2012/07
  • シンポジウムオーガナイザー「北海道大学グローバルCOEシンポジウム 第１７回精密合成化学セミナー ジョイントシンポジウム」「分子変換と機能開発の新基軸」
    大熊 毅 2011/10
  • シンポジウムオーガナイザー「第２３回万有札幌シンポジウム」「有機化学の深化と多様化」
    大熊 毅 2011/07
  • 新聞記事掲載「超高速の不斉水素化触媒」「化学工業日報」
    2011/06
  • シンポジウムオーガナイザー「第１６回精密合成化学セミナー」
    大熊 毅 2011/01
  • シンポジウムオーガナイザー「精密合成化学セミナー」「有機合成化学の新基軸」
    大熊 毅 2009/01
  • シンポジウムオーガナイザー「北海道大学グローバルCOEシンポジウム」「触媒的不斉合成の最先端」
    大熊 毅 2008/10
  • 北海道大学大学院工学研究科公開講座「応用理工学研究の最先端〜豊かな生活を 目指して〜」「分子の世界の右手と左手」
    2007/10
  • 日本化学会・ディビジョンレポート執筆
    2007
  • イノベーション・ジャパン２００７-大学見本市
    2007
  • 夢・化学−２１「北海道大学化学系への二日間体験入学」
    2007
  • 新聞記事掲載
    2007
  • Division reports of Japan Chemical Society
    2007
  • Inovation Japan 2007
    2007
  • 「不斉還元」, 日本化学会
    2004 -2006
  • 新聞記事掲載
    2005
  • 「Chirality in the Molecular World」
    2004

Research Projects

  • Japan Society for Promotion of Science：科学研究費助成事業
    Date (from‐to) : 2024/04 -2027/03 
    Author : Takeshi Ohkuma
  • Japan Society for the Promotion of Science：Kakenhi (B)
    Date (from‐to) : 2019/04 -2022/03 
    Author : Takeshi Ohkuma
  • 特異な配位子効果に基づく高機能金属錯体触媒の開拓
    日本学術振興会：科学研究費補助金(基盤研究(B))
    Date (from‐to) : 2015 -2017 
    Author : 大熊 毅
  • Strategic Molecular and Materials Chemistry through Innovative Coupling Reactions
    Ministry of Education, Culture, Sports, Science, and Technology, Japan：文部科学省特別経費 大学の特性を生かした学術研究機能の充実
    Date (from‐to) : 2012/04 -2016/03 
    Author : OHKUMA Takeshi
  • Overseas Visit Program for Young Prospective Researchers Involved in Innovative Chemistry for Efficient Molecular Conversion and the Creation of New Functional Materials
    Japan Society for the Promotion of Science：Strategic Young Researcher Overseas Visits Program for Accelerating Brain Circulation
    Date (from‐to) : 2012/10 -2015/03 
    Author : OHKUMA Takeshi
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 2012 -2014 
    Author : OHKUMA Takeshi
     
    Chiral Ru-Li combined systems developed by our research group efficiently catalyzed 1) hydrocyanation of aldehydes and N-protected aldimines, 2) cyanosilylation of simple and α-alkoxy ketones, and 3) conjugate hydrocyanation of α,β-unsaturated ketones and N-acylpyrroles. The substrate-to-catalyst molar ratio of 10,000 and enantioselectivity of 99% were achieved in the best cases. The novel chiral Ru complexes achieved 1) very rapid and highly enantioselective hydrogenation of ketones, 2) asymmetric hydrogenation of N-arylimines, quinoxalines, and benzoxazines. The rate (turnover frequency) of the hydrogenation of ketones reached about 35,000 per minute with grater than 99% enantioselectivity. The turnover number of 18,000 and enantioselectivity of 99% in the reaction of N-arylimines were obtained in the best cases.
  • 医薬合成重要原料「光学活性プロパルギルアルコール類」の高純度合成
    科学技術振興機構：研究成果最適展開支援プログラム(A-STEP)(フィージビリティスタディ（探索タイプ））
    Date (from‐to) : 2012/11 -2013/10 
    Author : 大熊 毅
  • 重要医薬原料「光学活性α-ヒドロキシラクトン類・エステル類」の高純度合成
    科学技術振興機構：研究成果最適展開支援プログラム(A-STEP)(フィージビリティスタディ（探索タイプ））
    Date (from‐to) : 2011/08 -2012/03 
    Author : 大熊 毅
  • 医薬等合成原料アルケン類の高効率合成法の開発
    科学技術振興機構：研究成果最適展開支援プログラム(A-STEP)(フィージビリティスタディ（探索タイプ））
    Date (from‐to) : 2010/10 -2011/03 
    Author : 大熊 毅
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 2009 -2011 
    Author : OHKUMA Takeshi
     
    Chiral Ru(II) and Ir(III) complexes developped by our research groupi efficiently catalyzed 1) asymmetric cyanosilylation of aldehydes and ketones, 2) asymmetric hydrogenation of ketones, and 3) asymmetric 1,3-hydride migration of allylic alcohols : 1) Enantioselectivity as high as 99% in the reaction with a substrate-to-catalyst molar ratio (S/C) of 10,000 was achieved. 2) A series of chiral alcohols which is hardly prepared by the other methods was readily synthesized in high enantioselectivity. One of these ractions has been commercialized in the synthetic process of a chiral medicine. 3) The highest enantioselectivity of 98% in the reaction with an S/C of 1000 was achieved
  • 医薬合成重要中間体「光学活性シアン化物」の高純度合成法の開発
    科学技術振興機構：平成２１年度シーズ発掘試験（発展型）
    Date (from‐to) : 2009/08 -2010/03 
    Author : 大熊 毅
  • 医薬合成鍵中間体「光学活性アミノアルコール類」の高効率合成
    科学技術振興機構：産学共同シーズイノベーション化事業 顕在化ステージ
    Date (from‐to) : 2008/12 -2009/11 
    Author : 大熊 毅
  • 医薬合成原料光学活性シアノヒドリンの高純度合成法の開発
    科学技術振興機構：平成２０年度シーズ発掘試験（発掘型）
    Date (from‐to) : 2008/07 -2009/03 
    Author : 大熊 毅
  • Ministry of Education, Culture, Sports, Science and Technology：Grants-in-Aid for Scientific Research(基盤研究(B))
    Date (from‐to) : 2006 -2007 
    Author : Takeshi OHKUMA
     
    A series of ruthenium complexes with both chiral diphosphine and diamine ligands was designed and applied to asymmetric hydrogenation of ketones. The obtained results are described below1) Chiral 1,4-diamine IPHAN was prepared from mannitol. The TolBINAP/IPHAN-Ru complex effectively catalyzed asymmetric hydrogenation of 1-tetralones and their analogues in a base containing 2-propanol. The reaction was completed with a substrate-to-catalyst molar ratio (S/C) as high as 55,000 to afford the chiral alcohols in up to 99% enantiomeric excess (ee). Substituted 2-cyclohexenones were also converted...
  • 光学活性アルコール類の合成法の開発
    新エネルギー・産業技術総合開発機構：大学発事業創出研究開発事業
    Date (from‐to) : 2004 -2006 
    Author : 大熊 毅
  • Ministry of Education, Culture, Sports, Science and Technology：Grants-in-Aid for Scientific Research(学術創成研究費)
    Date (from‐to) : 2002 -2006 
    Author : Ryoji NOYORI, 大熊 毅, 斎藤 進, 伊丹 健一郎
     
    (1) Asymmetric Hydrogenation of Ketones: Chiral RuC1_2(binap)(1, 2-diamine) complexes allow rapid, enantioselective hydrogenation of various simple, unfunctionalized ketones with a high substrate/catalyst molar ratio up to 2, 400, 000. As high practicality of this procedure became recognized, we have been encouraged to develop a robust (pre)catalyst that promotes the enantioselective reaction under base-free conditions. During the course of this program, we established that RuH(η^1-BH_4)(binap)(1, 2-diamine) complexes allow for asymmetric hydrogenation of simple ketones in 2-propanol withou...
  • Ministry of Education, Culture, Sports, Science and Technology：Grants-in-Aid for Scientific Research(基盤研究(B))
    Date (from‐to) : 2003 -2004 
    Author : Takeshi OHKUMA
     
    Chiral diphosphine/1,2-diamine Ru(II) complexes catalyze the rapid, productive, and enantioselective hydrogenation of simple ketones. The reaction proceeds smoothly even at an atmospheric pressure of H_2 at room temperature and is further accelerated by addition of an alkaline base or a strong organic base. Most importantly, the hydrogenation rate is initially increased to a great extent with an increase in base molarity, but subsequently decreases. Without a base, the rate is independent on H_2 pressure in the range of 1-16 atm, while in the presence of a base, the reaction is accelerated ...
  • 新規水素化触媒の開発
    新エネルギー・産業技術総合開発機構：産業技術実用化開発事業
    Date (from‐to) : 2002 -2004 
    Author : 大熊 毅
  • 金属ナノ粒子を用いる立体選択的水素化反応の開発
    基礎科学研究
    Date (from‐to) : 2004
  • Development of Stereoselective Hydrogenation Catalyzed by Metal Nanoparticles
    Basic Science Research Program
    Date (from‐to) : 2004
  • Ministry of Education, Culture, Sports, Science and Technology：Grants-in-Aid for Scientific Research(基盤研究(B))
    Date (from‐to) : 2001 -2002 
    Author : Takeshi OHKUMA
     
    Homogeneous asymmetric catalysis provides a fundamental tool for the preparation of chiral building blocks for biologically important substances and advanced materials. Polymer-bound catalysts have inherent operational and economical advantages : immobilization on solid matrices facilitates the separation from reaction mixtures, recovery, and reuse of the expensive chiral compounds. Further, the solid-phase reaction offers a technical basis for diversity-oriented combinatorial synthesis. Numerous resin-supported (pre)catalysts have been developed along this line, though their practical appl...
  • 文部科学省：科学研究費補助金(特定領域研究(A), 特定領域研究)
    Date (from‐to) : 2001 -2002 
    Author : 大熊 毅
     
    本研究者の開拓した光学活性ジホスフィンとジアミンを配位子とするルテニウムジクロロ錯体は、アルカリ塩基の存在下、種々の芳香族およびα,β-不飽和ケトン類、アミノケトン類等の水素化に対して極めて高い触媒活性とエナンチオ選択性を示す。この塩化物錯体は、大気中でも安定なため操作性に優れているが、活性種を発生させるために強塩基の添加が不可欠である。したがって、塩基性条件下で不安定なケトン類の水素化には適用が困難であった。本研究では、塩基を添加せずに活性種を発生する触媒前駆体の探索研究を行った。塩化物錯体trans-RuCl_2[(S)-xylbinap][(S,S)-dpen](XylBINAP=2,2'-ビス(ジ-3,5-キシリルホスフィノ)-1,1'-ビナフチル、DPEN=1,2-ジフェニルエチレンジアミン)に水素化ホウ素ナトリウムを作用させることにより、ヒドリド錯体trans-RuH(η^1-BH_4)[(S)-xylbinap][(S,S)-dpen]を得た。この錯体は、塩基無添加条件でケトン類の水素化に対して極めて高い触媒活性とエナンチオ選択性を示した。例えば、アセトフェノンを10万分の1当量の錯体を用い、水素8気圧で水素化すると、反応は7時間で完結し、(R)-1-フェニルエタノールが99%の鏡像体過剰率で得られた。次に、塩基性条件下で容易に異性化するラセミ体α位置換シクロヘ...
  • Ministry of Education, Culture, Sports, Science and Technology：Grants-in-Aid for Scientific Research(基盤研究(B))
    Date (from‐to) : 1999 -2000 
    Author : Takeshi OHKUMA
     
    The development of practical methods effecting stereoselective hydrogenation of simple ketones is highly desirable, since the existing homogeneous catalysts lack reactivity and/or stereoselectivity. A new Ru (II) complex, trans-RuCl_2 [(S)-xylbinap][(S)-daipen] or the R, R enantiomer acts as an excellent precatalyst for asymmetric hydrogenation of simple ketones (XylBINAP=2, 2'-bis (di-3, 5-xylylphosphino)-1, 1'-binaphthyl. DAIPEN=1, 1-dianisyl-2-isopropyl-1, 2-ethylenediamine). The reaction is conducted with a substrate/catalyst molar ratio of up to 100000 in 2-propanol containing alkaline...
  • 分子触媒を用いる不斉合成反応の開発
    基礎科学研究
    Date (from‐to) : 1994
  • Development of Asymmetric Reactions with Molecular Catalysts
    Basic Science Research Program
    Date (from‐to) : 1994
  • 日本学術振興会：科学研究費助成事業
    Date (from‐to) : 1988 -1989 
    Author : 大熊 毅

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