into the carbon–halogen bond. The resultant species undergo coupling with alkenes leading to vinylated chromones. Vinylation occurs regiospecifically at the original site of bromination and therefore provides a method for the clean introduction of substituents into the chromone ring system. An anomalous reaction of a dibrominated chromone leading to a ring-opened product is described.
溴色酮的活化是通过将Pd 0插入碳-卤素键来实现的。所得的物质与烯烃偶联,产生
乙烯基化的
色酮。
乙烯基化区域特异性地在
溴化的原始位置发生,因此提供了将取代基干净地引入
色酮环系统的方法。描述了二
溴苯甲酮的异常反应导致开环产物。