作者:Michał Barbasiewicz、Jan Nowak、Michał Tryniszewski
DOI:10.1055/a-2268-4386
日期:——
methylmalonate, which converts electrophilic aryl aldehydes into α-methylcinnamates in up to 70% yield. The reaction plausibly proceeds through the formation of β-lactone that spontaneously decarboxylates under the reaction conditions. The results shed light on the Knoevenagel–Doebner olefination, for which decarboxylative anti-fragmentation of aldol-type adducts is usually considered.
杂原子烯化试剂(如有机膦酸酯、磺酸酯等)用于将羰基化合物转化为烯烃,其作用机制涉及羟醛型加成、环化和四元环中间体的断裂。我们开发了一种使用 1,1,1,3,3,3-六氟异丙基甲基丙二酸乙酯的类似工艺,可将亲电芳基醛转化为 α-甲基肉桂酸酯,产率高达 70%。该反应似乎是通过形成β-内酯进行的,β-内酯在反应条件下自发脱羧。结果揭示了克诺文格尔-多布纳烯化反应,通常考虑羟醛型加合物的脱羧反断裂。