Resolution of Carboxylic Acids Using Copper(I)-Promoted Removal of Propargylic Esters under Neutral Conditions
作者:Partha Ghosh、Jeffrey Aubé
DOI:10.1021/jo200433w
日期:2011.5.20
A method for the optical resolution of carboxylic acids is described. Condensation of racemic carboxylic acids with chiral terminal propargyl alcohols gave separable diastereomeric esters. Chromatographic separation followed by heating the individual diastereomers in methanol with catalytic copper(I) halide regenerated the carboxylic acids in good yields and in enantiomeric ratios of ≥94%. This method
描述了羧酸的光学拆分方法。外消旋羧酸与手性末端炔丙醇缩合得到可分离的非对映体酯。色谱分离,然后在甲醇中加热单个非对映异构体和催化卤化铜 (I),以良好的收率和≥94% 的对映体比率再生羧酸。该方法对于拆分与常规酯水解不相容的羧酸特别有用。