Nickel-Catalyzed anti -Markovnikov Hydrodifluoroalkylation of Unactivated Alkenes.

An efficient Ni-catalyzed hydrodifluoroalkylation of unactivated alkenes with bromodifluoroacetate by using PhSiH 3 as hydride source was developed. The transformation affords aliphatic difluorides with anti -Markovnikov regioselectivity. A wide range of highly remote alkenes, simple alkenes, drug molecules, commercially available CF 2 precursors, and even nonfluorinated substrates are competent in this reaction under mild conditions, demonstrating the practicability of the strategy. Moreover, mechanistic studies indicated that the difluoroalkyl radical might be a key intermediate to this transformation.