Copper(I)-Catalyzed Intramolecular Trifluoromethylation of Methylenecyclopropanes

Copper­(I)-catalyzed intramolecular trifluoromethylation of methylene­cyclopropanes has been developed to produce a variety of CF3-substituted dihydro­naphthalenes in moderate to good yields, relying on the construction of C­(sp2)–CF3 bonds under mild conditions. The reactions proceed through a radical process under copper­(I) catalysis with a good compatibility for the functional group.