A range of bench-stable carbazole-containing hypervalent iodine(III) reagents I (R = H, I, Cl, Br) was synthesized by I-N bond formation in good yields.This kind of benziodoxolone reagents was used for a C-N coupling reaction to introduce a carbazole group to aromatic heterocycle compounds such as 3-methylbenzo[b]thiophene, 3-methylbenzofuran, thieno[3,2-b]thiophene, etc.