Copper-Catalyzed Bromodifluoroacetylative Cyclization of Enynes

J Org Chem. 2020 Dec 4;85(23):15667-15675. doi: 10.1021/acs.joc.0c02114. Epub 2020 Nov 11.

Abstract

A copper-catalyzed bromodifluoroacetylative cyclization reaction is described. The treatment of bromodifluoroacete derivatives by CuI and B2Pin2 enables difluoroalkyl radical generation and triggers the radical addition/cyclization/bromination sequences. Bromodifluoroacetyl-derived ester, amide, and ketone were compatible and gave various vinyl C-Br bonds containing functionalized heterocycles in good yields.