K2S2O8-Mediated halogenation of 2-arylimidazo[1,2-a]pyridines using sodium halides as the halogen sources
作者:Praewpan Katrun、Chutima Kuhakarn
DOI:10.1016/j.tetlet.2019.03.008
日期:2019.4
halogenation of 2-arylimidazo[1,2-a]pyridines using sodium chloride/bromide/iodide as the halogen sources in the presence of K2S2O8 as an easy-to-handle oxidizing agent was developed. The present work offers an efficient and rapid access to 3-chloro-, 3-bromo- and 3-iodo-2-arylimidazo[1,2-a]pyridines which can be readily converted to C3-substituted imidazo[1,2-a]pyridines by cross-coupling reactions.
开发了在K 2 S 2 O 8作为易于处理的氧化剂存在下,使用氯化钠/溴化物/碘化物作为卤素源,方便地卤化2-芳基咪唑并[1,2- a ]吡啶的方法。本工作提供了一种快速有效地获得3-氯-,3-溴-和3-碘-2-芳基咪唑并[1,2- a ]吡啶的方法,这些吡啶基很容易转化为C 3取代的咪唑并[1,2] -一个]吡啶通过交叉偶联反应。