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 antihistamine agent 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
通过在脯氨酸衍生的氯乙基吡咯烷与对映异构体富集的叔醇之间形成醚,实现了抗组胺剂clemastine作为其(S,S)-立体异构体的首次对映选择性合成。叔醇由α-甲基-对氯苄基醇的氨基甲酸酯衍生物通过锂化时的芳基反型迁移而形成。产品的(S,S)立体化学证实了重排的反相性质。