This report describes the reactions between N-heterocyclic
carbene
copper(I) fluoroalkyl complexes and aryl halides bearing ortho-directing groups. Pyridine, pyrazole, oxazoline, imine, and ester
directing groups are shown to dramatically enhance the reactivity
of aryl bromides and chlorides with (IPr)CuI–fluoroalkyl
complexes (IPr = 1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene;
fluoroalkyl = difluoromethyl and pentafluoroethyl) to afford aryl–fluoroalkyl
coupling products. This approach is leveraged to achieve the Cu-catalyzed
directed fluoroalkylation of a series of aryl bromide substrates.
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