A New Combined Source of “CN” from N,N-Dimethylformamide and Ammonia in the Palladium-Catalyzed Cyanation of Aryl C−H Bonds

摘要

An unprecedented protocol for cyanation at arene C−H bonds has been developed by employing N,N-dimethylformamide and ammonia as a combined source for the cyano “CN” unit. Isotopic incorporation experiments revealed that the carbon and nitrogen of the “CN” originate from the N,N-dimethyl moiety of DMF and ammonia, respectively. The present cyanation reaction shows an excellent degree of regioselectivity, producing only monosubstituted nitriles at the less hindered C−H position, and it allows for the preparation of doubly labeled nitrile compounds for the first time.