A Tandem Ester Cleavage-Michael Addition Reaction for the Synthesis of Oxygen Heterocycles
作者:R. A. Bunce、M. J. Bennett
DOI:10.1080/00397919308013298
日期:1993.4
Abstract A tandem ester cleavage-Michael addition sequence has been developed for the preparation of five- and six-ring oxygen heterocycles bearing an acetic acid residue at C-2. Treatment of ethyl 6- or 7-acetyloxy-2-alkenoates with ethanolic sodium ethoxide affords the tetrahydrofuran and tetrahydropyran products in 70–90% yields. The reaction is clean and appears to be a general route for the preparation
摘要 已经开发了串联酯裂解-迈克尔加成序列,用于制备在 C-2 处带有乙酸残基的五环和六环氧杂环。用乙醇乙醇钠处理 6- 或 7-乙酰氧基-2- 烯酸乙酯,得到四氢呋喃和四氢吡喃产物,产率 70-90%。该反应是干净的,似乎是制备这些化合物的一般途径。初始乙酸酯裂解的空间位阻和闭合大环时不利的熵似乎是该过程的唯一限制。