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Chin. J. Org. Chem. ›› 2005, Vol. 25 ›› Issue (06): 720-723. Previous Articles     Next Articles

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手性硼酸酯介入的不对称合成3† (R)-或(S)-1,1'-联-2-萘酚硼酸-(S)-脯氨酸酐促进的前手性亚胺的不对称硼烷还原

单自兴*，王铨   

  1. (武汉大学化学系 武汉 430072)
  • 收稿日期:2004-03-12 修回日期:2004-12-10 发布日期:2005-05-30
  • 通讯作者: 单自兴

Chiral Borate Esters in Asymmetric Synthesis 3† Asym-metric Borane Reduction of Prochiral Imines Promoted by (R)- or (S)-1,1-Bi-2- naphthoxyboric Acid (S)-Proline An-hydride

SHAN Zi-Xing*, WANG Quan   

  1. (Department of Chemistry, Wuhan University, Wuhan 430072)
  • Received:2004-03-12 Revised:2004-12-10 Published:2005-05-30
  • Contact: SHAN Zi-Xing

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Asymmetric catalytic activity of chiral spiroborate esters, (R)- or (S)-1,1-bi-2-naphthoxyboric acid (S)-proline anhydride [(R,S)-1 or (S,S)-1], toward borane reduction of prochiral imines has been observed. In the presence of (R,S)-1 or (S,S)-1, prochiral imines generated from con-densation of aniline and a prochiral dialkyl ketone or alkylphenyl ketone were reduced by borane in THF to give chiral secondary amines in high yield and up to 74% ee. Among them, N-(2-pentyl)aniline, N-(3-methyl-2-butyl)aniline and N-(4-methyl-2-pentyl)aniline have not been reported before.

Key words: reduction, chiral spirobroate ester, asymmetric catalysis, prochiral imine