CuBr-Catalyzed Aerobic Decarboxylative Cycloaddition for the Synthesis of Indolizines under Solvent-Free Conditions
作者:Wenhui Wang、Junwen Han、Jinwei Sun、Yun Liu
DOI:10.1021/acs.joc.6b02455
日期:2017.3.17
An efficient synthesis of diversified indolizine derivatives was developed via CuBr-catalyzed reaction of pyridines, methyl ketones and alkenoic acids under solvent-free conditions in oxygen atmosphere. This synthesis involves cascade processes of copper-catalyzed bromination of the methyl ketone, 1,3-dipolar cycloaddition of the pyridinium ylide with the alkenoic acid, followed by oxidative decarboxylation
通过在无溶剂条件下于氧气气氛中通过CuBr催化吡啶,甲基酮和链烯酸的反应,开发了多种吲哚嗪衍生物的有效合成方法。该合成涉及级联过程,该过程包括铜催化的甲基酮的溴化,吡啶鎓内鎓盐与链烯酸的1,3-偶极环加成反应,然后是初级环加合物的氧化脱羧和脱氢芳构化。通过该协议,可以在一锅中从简单底物中选择性地制备出具有不同取代模式的多种吲哚尼酮,并获得了良好或优异的收率。