Gold(I)-Catalyzed [2+4] Cycloaddition of 1,1-Difluoroallenes with Conjugated Enones: Synthesis of Ring-Difluorinated Dihydro-2H-Pyrans

1,1-Difluoroallenes underwent regioselective [2+4] cycloaddition with α,β-unsaturated ketones (enones) in the presence of an AuCl(IPr)–AgSbF6 catalyst. β-Aurated, charge-localized difluoroallylic carbocations, formed from 1,1-difluoroallenes and the cationic Au catalyst, were stabilised...