Regioselective C3 Functionalizations of 9H‐Carbazoles via C(sp2)−H Insertions of RhII Carbenoids

Abstract A series of 9 H ‐carbazoles were synthesized via a direct regioselective C3 functionalization through C(sp 2 )−H insertion of α‐imino rhodium(II) carbenoids generated in situ from 1‐sulfonyl‐1,2,3‐triazoles. A variety of 1‐sulfonyl‐1,2,3‐triazoles underwent this reaction in the presence of a rhodium(II) catalyst, and a mechanism was proposed. Further regioselective C−H amination of the obtained 3‐enamido carbazoles to synthesize (indol‐3‐yl)‐9 H ‐carbazoles, biologically valuable motifs, supported the utility of this method.