Direct oxidative CâO cross-coupling reaction between active alkenes and carboxylic acids is presented. By utilizing Pd(OAc)2 as a catalyst and PhI(OAc)2 as an oxidant, ketene dithioacetals were smoothly acyloxylated in carboxylic acidâwater solution, affording a variety of vinyl esters in a highly selective way with high efficiency and good functional group tolerance. A plausible mechanism is proposed that features a vinyl iodonium species as key intermediate.
本文介绍了一种活性烯烃与
羧酸之间的直接氧化 C–O 交叉偶联反应。通过使用 Pd(OAc)₂ 作为催化剂和 PhI(OAc)₂ 作为氧化剂,酮烯二
硫乙酰
缩醛在
羧酸-
水溶液中顺利地进行了酰氧基化,获得了一系列高选择性、高效率且对功能团具有良好耐受性的
乙烯基酯。提出了一种合理的机制,特征是以
乙烯基碘离子物种作为关键中间体。