[2+2+2] cycloadditionreaction with two alkyne molecules under nickelcatalysis to afford a 1,2‐dihydropyridine derivative in moderate to good yield. The reaction is likely to involve oxidative cyclization of the imine and alkyne, insertion of another alkyne, and CN reductive elimination, followed by a 1,5‐sigmatropic hydrogen shift. The pyridyl group is proposed to facilitate the reaction by chelation
Nickel-Catalyzed Enantioselective Reductive Arylation and Heteroarylation of Aldimines via an Elementary 1,4-Addition
作者:Luoqiang Zhang、Xiuhua Wang、Maoping Pu、Caiyou Chen、Peng Yang、Yun-Dong Wu、Yonggui Robin Chi、Jianrong Steve Zhou
DOI:10.1021/jacs.3c00548
日期:2023.4.19
Nickel catalysts of chiral pyrox ligands promoted enantioselective reductive arylation and heteroarylation of aldimines, using directly (hetero)aryl halides and sulfonates. The catalytic arylation can also be conducted with crude aldimines generated from condensation of aldehydes and azaaryl amines. Mechanistically, density functional theory (DFT) calculations and experiments pointed to an elementary