Abstract
Cu-catalyzed direct difluoromethylation of activated alkenes through a difluoromethyl radical addition/cyclization to afford difluorinated oxindoles and quinoline-2,4-diones has been developed. This method provides convenient access to a variety of oxindoles and quinoline-2,4-diones under mild conditions via a proposed tandem radical cyclization process, while tolerating various functional groups well. Moreover, a facile method to construct diverse difluorinated quinoline-2,4-diones by visible-light photoredox catalysis under mild conditions was presented.
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