Divergent Rearrangements of Cyclopropyl-Substituted Fluoroepoxides Involving C–F Bond Cleavage and Formation
作者:Tao Luo、Rui Zhang、Wei Zhang、Xiao Shen、Teruo Umemoto、Jinbo Hu
DOI:10.1021/ol403644n
日期:2014.2.7
Unprecedented divergent rearrangements of cyclopropyl-substituted fluoroepoxides are reported. In the presence of a catalytic amount of benzoic acid, cyclopropyl-substituted fluoroepoxides efficiently undergo 1,5-fluorine migration. However, when the fluoroepoxides are heated with K2CO3 at 60 °C, 1,2-fluorine migration occurs. The 1,5-fluorine migration is believed to proceed via a carbocation intermediate
据报道,环丙基取代的氟环氧化物发生了前所未有的发散重排。在催化量的苯甲酸存在下,环丙基取代的氟环氧化物有效地经历了1,5-氟的迁移。然而,当将氟环氧化物与K 2 CO 3在60°C下加热时,会发生1,2-氟迁移。据信1,5-氟迁移通过碳正离子中间体进行,而1,2-氟迁移可能涉及紧密的离子对中间体或通过协同过程进行。