A process for obtaining a substantially pure enantiomer of an aryl-substituted aliphatic carboxylic acid is described. The process utilizes first an enantiomerically enriched mixture the of aryl-substituted aliphatic carboxylic acid obtained from kinetic resolution, diastereomeric crystallization or asymmetric synthesis processes. This enriched mixture is reacted with a base producing a salt that has the following properties: (1) has at least one eutectic point; (2) a composition that is not at the eutectic point; and (3) a eutectic composition that is closer to the racemic composition than is the eutectic composition of said aryl-substituted carboxylic acid. Substantially pure, enantiomeric salt is separated, leaving a mother liquor comprising the solvent and aryl-substituted aliphatic carboxylic acid enriched in the other enantiomer.
本文描述了一种获得芳基取代脂肪族
羧酸的对映体高度纯度的过程。该过程首先利用动力学分辨、对映异构体结晶或不对称合成过程获得的芳基取代脂肪族
羧酸对映体富集混合物。然后,将这个富集混合物与碱反应,产生具有以下特性的盐:(1)至少具有一个共晶点;(2)具有不在共晶点的组成;(3)共晶组成比所述芳基取代
羧酸的共晶组成更接近于混合物。分离出高度纯度的对映体盐,留下含有溶剂和富集其他对映体的芳基取代脂肪族
羧酸的母液。