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The nucleophilic iron complex Bu4NFe(CO)3(NO) (TBAFe) catalyzes the direct intramolecular C-H amination of α-azidobiaryls and (azidoaryl)alkenes into the corresponding carbazoles and indoles, respectively, under mild conditions and with low catalyst loadings. These features and the broad functional-group tolerance render this method a particularly attractive alternative to established noble-metal-based procedures.
Alt et al. (Wed,) studied this question.