Nickel-Catalyzed Regiodivergent Cyanation of Allylic Alcohols: Scope, Mechanism, and Application to the Synthesis of 1,<i>n</i>-Dinitriles

Abstract

Here, we report a regiodivergent cyanation of allylic alcohols under nickel catalysis. With a delicate control over the regioselectivity of allylic cyanation, more challenging branched products were successfully obtained. A variety of alkenyl nitriles and branched allylic nitriles can be synthesized. In addition, dinitriles can also be achieved from the corresponding allylic alcohols in good yields with high selectivity by a subsequent hydrocyanation process. The obtained dinitriles can easily undergo amidation or reduction or can be converted to heterocycles, piperidines, and multisubstituted pyridines. Density functional theory (DFT) calculations offered more information on the crucial role of ligands in tuning the regioselectivity and reactivity.