Ultrasound-Promoted and Base-Mediated Regioselective Bromination of Imidazo[1,2-a]pyridines with Pyridinium Tribromide
作者:Qing-Wen Gui、Hongmei Jiang、Dingyi Guo、Yixin Zhang、Qin-Peng Shen、Shiyun Tang、Junheng You、Yi Huo、Huixian Wang
DOI:10.1055/s-0040-1707856
日期:2020.9
Abstract By using pyridinium tribromide as the bromo source, an efficient and practical protocol for the synthesis of C3-brominated imidazo[1,2-a]pyridines through ultrasound-promoted and Na2CO3-mediated regioselective bromination of imidazo[1,2-a]pyridines has been developed. This method effectively avoids the use of metal catalysts and harsh reaction conditions, and shows attractive characteristics
摘要 通过使用三溴化吡啶鎓作为溴源,通过超声促进和Na 2 CO 3介导的咪唑并[1,2-]区域选择性溴化合成C3-溴化的咪唑并[1,2- a ]吡啶的有效而实用的方案。已经开发了α ]吡啶。该方法有效地避免了使用金属催化剂和苛刻的反应条件,并显示出引人注目的特性,例如操作简便,宽范围的基材范围以及良好至优异的收率,易于规模化生产和高能源效率。