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Photoredox Catalytic Trifluoromethylation and Perfluoroalkylation of Arenes Using Trifluoroacetic and Related Carboxylic Acids

A mild and practical method has been achieved that
allows for the direct C–H trifluoromethylation, perfuoroalkylation and
chlorodifluoromethylation of (hetero)arenes using inexpensive and abundant
trifluoroacetic acid and the corresponding carboxylic acids. A diverse array of
arenes and heteroarenes were successfully transformed into valuable
fluoroalkylated compounds. The combination of photoredox catalysis and a diaryl
sulfoxide provides a platform for the facile generation of fluoroalkyl radicals
from the corresponding fluoroalkyl carboxylic acids under mild conditions.