Cycloaddition Reactions of Thiazolium Azomethine Ylides: Application to Pyrrolo[2,1-<i>b</i>]thiazoles
作者:Craig R. Berry、Craig A. Zificsak、Alan C. Gibbs、Dennis J. Hlasta
DOI:10.1021/ol071229n
日期:2007.10.1
Thiazolium azomethineylides, equipped with a C-2 methanethiol group, participate in an efficient [3 + 2] cycloaddition reaction with acetylene derivatives to yield unique pyrrolo[2,1-b]thiazoles. The elimination of the methanethiol leaving group from the cycloadduct has replaced the need for a separate oxidation step and suppresses ring-opening side reactions. Products were obtained in short synthetic