A Direct Cycloaminative Approach to Imidazole Derivatives via Dual C–H Functionalization

Organoiodine(III)-promoted C(sp 3 )–H azidation was a key step for the cycloaminative process. An unprecedented method for metal-free dehydrogenative N-incorporation into C(sp 3 )–H and C(sp 2 )–H bonds for the synthesis of diverse imidazoles has been disclosed. The overall transformation involves the construction of four C–N bonds through hydroamination-azidation-cyclization sequence. The reaction can be easily handled and proceeds under mild conditions. Further, the potential of the present strategy is revealed by the practical synthesis of N-heterocyclic carbene (NHC) precursors.