New routes to alkoxymaleic anhydrides 1a/b have been described in good yields via base-induced chemoselective vinylic substitution of bromo atom in bromomaleimide 4 with alkanols, and base-induced oxa-Micahel addition of alkanols to dialkyl acetylenedicarboxylates 8a/b as key steps. An unusual acyl exchange in the conversion of 6a/b to 1a/b under very simple and mild reaction conditions is noteworthy.
描述了一种通过碱诱导的
化学选择性烯丙基取代反应,将
溴代马来
酰亚胺 4 中的
溴原子与
醇类反应,良好产率地合成了醇氧基
马来酸酐 1a/b。此外,
醇类与二烷基
乙炔二
羧酸酯 8a/b 的碱诱导的氧-Michael 加成反应也是关键步骤。值得注意的是,在非常简单和温和的反应条件下,将 6a/b 转化为 1a/b 过程中发生了不寻常的酰基交换反应。