Catalytic asymmetric desymmetrization of prochiral and meso compounds
申请人:——
公开号:US20040082809A1
公开(公告)日:2004-04-29
The present invention relates to methods for the synthesis of chiral non-racemic products, e.g., enantiomerically-enriched hemiesters, from prochiral and meso starting materials, e.g., prochiral and meso cyclic anhydrides. The present invention also relates to catalysts for the aforementioned methods, and methods for synthesizing these catalysts.
The opposite diastereoselectivity in the alkylation and protonation of enolates
作者:Yoshinori Yamamoto、Kazuhiro Maruyama
DOI:10.1039/c39840000904
日期:——
enoate (5) produces predominantly the syn-isomer (7) having the butyl and methyl groups syn on the carbon chain, while the methylation of the enolate derived from the ester (8) gives preferentially the other diastereoisomer, anti-(6); the diastereoselectivity can be explained by an eclipsed model.