Allene epoxidation: synthesis of functionalized lactones by the DMDO oxidation of allenic acids
作者:Jack K Crandall、Elisa Rambo
DOI:10.1016/s0040-4020(02)00698-1
日期:2002.8
products are formed directly from allene oxides, keto lactones are formed. The corresponding spirodioxide intermediates give lactones with appropriately situated α-hydroxyketone moieties. An understanding of the regiochemistry of the epoxidations and the subsequent cyclizations of the reactive intermediates is developed, as are methods for the manipulation of the experimental conditions to favor the
通过二甲基二环氧乙烷促进的氧化环化反应,一系列烯丙基羧酸已转化为官能化的内酯。这些转化通过未分离的氧化烯和螺二氧化物中间体的参与而合理化。起始烯丙酸的结构和反应条件决定了这两个中间物种中的哪个充当分离产物的来源。所制备的氧化剂溶液的使用通常通过螺二氧化物进行。而原位反应通常会产生衍生自氧化烯的产物。当直接由氧化烯形成产物时,会形成酮内酯。相应的螺二氧化物中间体产生具有适当定位的α-羟基酮部分的内酯。