Cyclofunctionalisation of epoxyalcohol derivatives. 4. Cyclisation of sulfonylacetate dianions: A synthesis of “MeBMT”
作者:Stuart W. McCombie、Bandarpalle B. Shankar、Ashit K. Ganguly
DOI:10.1016/s0040-4039(01)93415-x
日期:——
α,α-Dianions, derived from arenesulfonylacetate esters of 2,3-epoxyalcohols, cyclised to give 3-arenesulfonyl-4-(1-hydroxyalkyl)-γ-butyrolactones. Dianion fragmentation to regenerate the epoxyalcohol was a competing, substrate-dependent process. Sulfonyllactone (9) was elaborated efficiently to an advanced intermediate for the unusual aminoacid “MeBMT” (5), and also to stereodefined cyclopropane derivatives
衍生自2,3-环氧醇的芳烃磺酰乙酸酯的α,α-二价阴离子被环化以生成3-芳烃磺酰基-4-(1-羟烷基)-γ-丁内酯。二价阴离子碎裂以再生环氧醇是一个竞争性的,依赖底物的过程。磺酰内酯(9)被有效地修饰为不寻常氨基酸“ MeBMT”(5)的高级中间体,以及立体定义的环丙烷衍生物。