A palladium(II) complex bearing a pyrazolyl-1,2,3-triazolyl hybrid ligand for C-H bond activation toward N-substituted carbazole synthesis.

A convenient phosphine-free strategy for synthesizing N-substituted carbazoles via "C-H" activation using a novel pyrazolyl-1,2,3-triazolyl Pd(II) complex is described. Dual "C-N" bond formation from 2-iodobiphenyls and amines affords carbazoles in good yields. Notably, benzenesulfonamides and aliphatic amines act as coupling partners, a transformation that has not been reported previously. The complex was confirmed by single-crystal X-ray diffraction.