Cobalt(II)-Catalyzed Intramolecular C−H Amination with Phosphoryl Azides: Formation of 6- and 7-Membered Cyclophosphoramidates

A highly effective Co(II)-based system has been developed for catalytic intramolecular C−H amination with phosphoryl azides without the need of terminal oxidant or other additives, resulting in the high-yielding production of cyclophosphoramidates with nitrogen gas as the byproduct. Additional features of this new catalytic system include the amination of primary C−H bonds and formation of 7-membered-ring structures.