gem-Difluorocyclopropanation of Alkenyl Trifluoroborates with the CF3SiMe3-NaI System
Abstract
Difluorocyclopropanation of alkenyl trifluoroborates using TMSCF3-NaI system was reported for the first time. The developed method allowed preparation of monocyclic, spiro- and fused-bicyclic gem-difluorocyclopropanes bearing additional functional groups. The preparation of potassium (2,2-difluorocyclopropyl)trifluoroborates was achieved in up to 90 % yield on a multigram scale.