Synthesis of (−)-(<i>S</i>,<i>S</i>)-clemastine by Invertive N → C Aryl Migration in a Lithiated Carbamate
作者:Anne M. Fournier、Robert A. Brown、William Farnaby、Hideki Miyatake-Ondozabal、Jonathan Clayden
DOI:10.1021/ol100627c
日期:2010.5.21
The first enantioselective synthesis of the antihistamineagent clemastine, as its (S,S)-stereoisomer, has been achieved by ether formation between a proline-derived chloroethylpyrrolidine and an enantiomerically enriched tertiary alcohol. The tertiary alcohol was formed from the carbamate derivative of α-methyl-p-chlorobenzyl alcohol by invertive aryl migration on lithiation. The (S,S)-stereochemistry