A General Asymmetric Aldol Reaction of Silyl Ketene Acetals Derived from Simple Esters to Aryl α-Keto Esters
作者:Julie Le Engers、Brian L. Pagenkopf
DOI:10.1002/ejoc.200901086
日期:2009.12
A general method for the enantioselective addition of O,O-ketene silyl acetals made from simple esters to α-keto esters catalyzed by a CuCl2·bis(oxazoline) complex is reported that overcomes the limitations of the classic aldol reaction, such as steric intolerance and the need for expensive thio esters. This method excels with aryl α-keto esters and provides products in good yield and high ee that
报道了一种由简单酯制成的 O,O-烯酮甲硅烷基缩醛对映选择性加成到 α-酮酯的通用方法,该方法克服了经典羟醛反应的局限性,如空间不耐受以及需要昂贵的硫代酯。该方法在处理芳基 α-酮酯方面表现出色,可提供高产率和高 ee 的产品,这是替代策略不容易获得的。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)