A palladium-catalyzed difluoromethylation of a series of heteroaryl chlorides, bromides and iodides under mild conditions is described. A wide range of heteroaryl halides such as pyridyl, pyrimidyl, pyrazyl, funanyl, thienyl, pyazolyl, imidazolyl, thiazolyl, and oxazolyl halides were efficiently difluoromethylated, thus providing medicinal chemists an alternative choice for the preparation of drug
Metallaphotoredox Difluoromethylation of Aryl Bromides
作者:Vlad Bacauanu、Sébastien Cardinal、Motoshi Yamauchi、Masaru Kondo、David F. Fernández、Richard Remy、David W. C. MacMillan
DOI:10.1002/anie.201807629
日期:2018.9.17
strategy for the difluoromethylation of arylbromides by metallaphotoredox catalysis. Bromodifluoromethane, a simple and commercially available alkyl halide, is harnessed as an effective source of difluoromethyl radical by silyl‐radical‐mediated halogen abstraction. The merger of this fluoroalkyl electrophile activation pathway with a dual nickel/photoredox catalytic platform enables the difluoromethylation