Intramolecular Csp(3)–H/C–C bond amination of alkyl azides for the selective synthesis of cyclic imines and tertiary amines

The intramolecular Csp(3)–H and/or C–C bond amination is very important in modern organic synthesis due to its efficiency in the construction of diversified N-heterocycles. Herein, we report a novel intramolecular cyclization of alkyl azides for the synthesis of cyclic imines and tertiary amines through selective Csp(3)–H and/or C–C bond cleavage. Two C–N single bonds or a C[double bond, length as m-dash]N double bond are efficiently constructed in these transformations. The carbocation mechanism differs from the reported metal nitrene intermediates and therefore enables metal-free and new transformation.