Copper-catalyzed synthesis of benzo[b]thiophene-fused imidazopyridines via the cleavage of C–H bond and C–X bond
作者:Hui Huang、Pan Dang、Lijun Wu、Yun Liang、Jianbing Liu
DOI:10.1016/j.tetlet.2015.12.091
日期:2016.2
A new and straightforward approach to synthesize benzo[b]thiophene-fused imidazopyridines has been developed by tandem cross-coupling reaction of K2S with 2-(2-bromophenyl)imidazo[1,2-a]pyridines, and K2S as sulfur source constructed double C-S bonds via the cleavage of the C-H bond and the C-X bond. In addition, the optical properties of a library of benzo[b]thiophene-fused imidazopyridines were for the first time fully characterized. Moreover, this synthetic strategy could be applied in the preparation of benzo[b]thiophene-fused indoles. (C) 2015 Elsevier Ltd. All rights reserved.