Fluorinated derivatives of 3-alkylidene-2(3H)-dihydrofuranone have been synthesized by sodium dithionite initiated tandem perfluoroalkylation-cyclization of allylic 2-alkynoates in fair to good yield and high stereoselectivity. Fluorinated 3-alkylidene-2(3H)-pyrrolidone derivatives were prepared similarly. A mechanistic rationale concerning the different radical steps and the differences between esters
通过
连二亚硫酸钠引发的烯丙基2-链烷酸酯的串联
全氟烷基化-环化反应合成了3-亚烷基-2(3H)-二氢
呋喃酮的
氟化衍
生物,其收率相当好且具有高立体选择性。类似地制备
氟化的3-亚烷基-2(3H)-
吡咯烷酮衍
生物。给出了关于不同的自由基步骤以及酯和酰胺之间的差异的机械原理。