Chiral α-Substituted Carbonyls and Alcohols from the S<sub>N</sub>2‘ Displacement of Cuprates on Chiral Carbonates: An Alternative to the Alkylation of Chiral Enolates
作者:Claude Spino、Christian Beaulieu、Julie Lafrenière
DOI:10.1021/jo000810t
日期:2000.10.1
A highly stereoselective sequence of reactions, based on the anti-selective S(N)2' addition of cuprates to allylic carbonates, transforms alkynes or alkenyl halides into carbonyls having alpha-chiral centers. The method, which uses menthone as a chiral auxiliary, is a useful alternative to the alkylation of chiral enolates with the added advantage of allowing for the "alkylation" of sec- and tert-alkyl
基于铜酸盐向烯丙基碳酸酯的抗选择性S(N)2'加成,高度立体选择性的反应序列将炔烃或烯基卤化物转化为具有α-手性中心的羰基。该方法使用薄荷酮作为手性助剂,是手性烯醇盐烷基化的一种有用的替代方法,具有允许仲烷基和叔烷基和芳基“烷基化”的额外优点。