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Organocatalytic Asymmetric Synthesis of Trifluoromethyl-substituted Diarylpyrrolines: Enantioselective Conjugate Cyanation of β-Aryl-β-trifluoromethyl-disubstituted Enones

Authors

  • Hiroyuki Kawai,

    1. Department of Frontier Materials, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-8555 (Japan)
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  • Satoshi Okusu,

    1. Department of Frontier Materials, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-8555 (Japan)
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  • Etsuko Tokunaga,

    1. Department of Frontier Materials, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-8555 (Japan)
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  • Hiroyasu Sato,

    1. Rigaku Corporation, 3-9-12 Mastubara-cho, Akishima, Tokyo 196-8666 (Japan)
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  • Dr. Motoo Shiro,

    1. Rigaku Corporation, 3-9-12 Mastubara-cho, Akishima, Tokyo 196-8666 (Japan)
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  • Prof. Norio Shibata

    Corresponding author
    1. Department of Frontier Materials, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-8555 (Japan)
    • Department of Frontier Materials, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-8555 (Japan)
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  • Support was provided by the Grants-in-Aid for Scientific Research (21390030, 23915014, 22106515, Project No. 2105: Organic Synthesis Based on Reaction Integration). We also thank the Asahi Glass Foundation for support in part.

Abstract

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Ether way: The cinchona-alkaloid-catalyzed title reaction was achieved in high yields with high to excellent ee values for the first time, and affords key intermediates for the biologically important 2 having a trifluoromethylated all-carbon quaternary chiral center. Ether-type catalysts (1) are more efficient in this transformation than the conventional hydroxy analogues.

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