A facile and highly efficient visible-light photoredox-catalyzed protocol for aryldifluoromethylation of acrylamides was developed using -(difluoromethyl)sulfonium salt as the difluoromethyl source. With this method, pharmaceutically interesting CFH-containing oxindoles were readily accessed from -arylacrylamides, and this method featured mild reaction conditions, a broad scope of substrates, good tolerance of functional groups, and good to excellent yields. Control experiments revealed that this protocol proceeded through a difluoromethylation/cyclization cascade process.
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