A palladium-catalyzed cyanation of the 3-position of indole sp(2) C-H bonds by the combination of NH(4)HCO(3) and DMSO as the "CN" source was achieved to provide aromatic nitriles in moderate to good yields with excellent regioselectivity. It represents a practical and safe cyanation method.
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Ren et al. (2011) studied this question.
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