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“ MeB
MT”(5)的高级中间体,以及立体定义的
环丙烷衍
生物。