Rh(<scp>iii</scp>)-Catalyzed dual C–H functionalization of 3-(1<i>H</i>-indol-3-yl)-3-oxopropanenitriles with sulfoxonium ylides or diazo compounds toward polysubstituted carbazoles
A rhodium-catalyzed annulation of 3-(1H-indol-3-yl)-3-oxopropanenitriles with sulfoxonium ylides or diazo compounds has been developed, leading to a series of polysubstituted carbazoles in moderate to good yields. This procedure proceeded with formal Rh(III)-catalyzed (4 + 2) cycloaddition, with the functionalization of 2-C–H bonds of indole in a step-economical procedure. Additionally, this reaction