efficient route for the coupling of maleimides with chromones at the C5-position has been developed under Ru(II) catalysis. It could provide 1,4-addition products and oxidative Heck-type products by switching additives. Benzoic acid led to the formation of 1,4-addition products under solvent-free conditions, and silver acetate was promoted to the generation of oxidative Heck-type products. Various maleimides
在Ru(II)催化下,已经开发了马来
酰亚胺与
色酮在C5位偶联的有效途径。通过切换添加剂可以提供1,4-加成产物和氧化性Heck型产物。在无溶剂条件下,
苯甲酸导致形成1,4-加成产物,
乙酸银被促进生成氧化型Heck型产物。各种马来
酰亚胺和
色酮适合于该转化,在短的反应时间内以良好至优异的产率提供所需的产物。为了理解该反应的机理,已经进行了
氘化研究和对照实验。