作者:Andrew Edwards、Pavel Ryabchuk、Alexey Barkov、Marina Rubina、Michael Rubin
DOI:10.1016/j.tetasy.2014.10.017
日期:2014.12
A general and efficient method for the preparative resolution of alpha- and beta-bromocyclopropylcarboxylic acids has been developed. This protocol involves a sequence of two crystallizations with pseudo-enantiomeric amines, cinchonine, and cinchonidine, which yield both enantiomers of the acid in highly enriched form. Both alkaloids can be easily recovered and reused multiple times without any loss of efficacy. (C) 2014 Elsevier Ltd. All rights reserved.