Highly enantioselective cyclopropanation of styrenes with diazoacetates catalyzed by optically active β-ketoiminato cobalt(II) complexes

Chemistry Letters

Volumn , Issue 12, 1999, Pages 1345-1346

  Ikeno, Taketo ^a   Sato, Mitsuo ^a   Yamada, Tohru ^a  

^a KEIO UNIVERSITY   (Japan)

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EID: 0033236857     PISSN: 03667022     EISSN: None     Source Type: Journal    
DOI: 10.1246/cl.1999.1345     Document Type: Article

References (16)

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6. These cobalt(II) complexes proved to be efficient catalysts for the enantioselective borohydride reduction of aryl ketones, N-phosphinyl imines, and α,β-unsaturated carboxamides; (ketones) T. Nagata, K. D. Sugi, T. Yamada, and T. Mukaiyama, Synlett, 1996, 1076; (imines) K. D. Sugi, T. Nagata, T. Yamada, and T. Mukaiyama, Chem. Lett., 1997, 493; (α,β-unsaturated carboxamides) T. Yamada, Y. Ohtsuka, and T. Ikeno, Chem. Lett., 1998, 1129.
7. These cobalt(II) complexes proved to be efficient catalysts for the enantioselective borohydride reduction of aryl ketones, N-phosphinyl imines, and α,β-unsaturated carboxamides; (ketones) T. Nagata, K. D. Sugi, T. Yamada, and T. Mukaiyama, Synlett, 1996, 1076; (imines) K. D. Sugi, T. Nagata, T. Yamada, and T. Mukaiyama, Chem. Lett., 1997, 493; (α,β-unsaturated carboxamides) T. Yamada, Y. Ohtsuka, and T. Ikeno, Chem. Lett., 1998, 1129.
8. These cobalt(II) complexes proved to be efficient catalysts for the enantioselective borohydride reduction of aryl ketones, N-phosphinyl imines, and α,β-unsaturated carboxamides; (ketones) T. Nagata, K. D. Sugi, T. Yamada, and T. Mukaiyama, Synlett, 1996, 1076; (imines) K. D. Sugi, T. Nagata, T. Yamada, and T. Mukaiyama, Chem. Lett., 1997, 493; (α,β-unsaturated carboxamides) T. Yamada, Y. Ohtsuka, and T. Ikeno, Chem. Lett., 1998, 1129.
9. The structure of cobalt(II) complex C' was determined by X-ray analysis. Unpublished result.
10. tBu) were prepared according to reference 2, and complexation with cobalt(II) were according to reference 5.
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