Design and development of highly effective lewis acid catalysts for enantioselective Diels-Alder reactions

被引:80
作者
Huang, Y [1 ]
Iwama, T [1 ]
Rawal, VH [1 ]
机构
[1] Univ Chicago, Dept Chem, Chicago, IL 60637 USA
关键词
D O I
10.1021/ja026088t
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
This report describes the design and development of chiral Co(III)-salen catalysts for enantioselective Diels-Alder reactions. A crystal structure of a Co-salen catalyst with two equivalents of benzaldehyde provided insight on the factors that may be important for enantioselectivity. On the basis of this structural information, new catalysts were prepared in which the "bay region" tert-butyl groups were replaced by trimethylsilyl groups. The new silyl-substituted catalysts were exceptionally effective (catalyst loadings down to 0.05 mol %) and convenient to use-room temperature, under an air atmosphere, using a minimum amount of solvent. Copyright © 2002 American Chemical Society.
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页码:5950 / 5951
页数:2
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