A straightforward and atom-economical base-free palladium-catalyzed regioselective direct arylation of coumarins and chromenones is devised. This protocol is compatible with a wide variety of electron-donating and -withdrawing substituents and allows construction of various biologically important flavone and neoflavone backbones.
设计了一种简单,原子经济的无碱
钯催化
香豆素和色农酮的区域选择性直接芳基化反应。该方案与多种供电子和吸电子取代基兼容,并允许构建各种
生物学上重要的
黄酮和新
黄酮骨架。