Photoredox‐ and Nickel‐Catalyzed Hydroalkylation of Alkynes with 4‐Alkyl‐1,4‐dihydropyridines: Ligand‐Controlled Regioselectivity

Abstract

Dual photoredox- and nickel-catalyzed hydroalkylation of terminal alkynes with 4-alkyl-1,4-dihydropyridines under visible light irradiation to afford Markovnikov- or anti-Markovnikov-type alkylated alkenes in good-to-high yields has been achieved, in which the regioselectivity of the products was effectively controlled by coordination ligands for nickel species. Using [NiCl₂ (dtbbpy)] as a catalyst led to the formation of Markovnikov-type products, whereas using NiCl₂ ⋅ 6 H₂ O led to the formation of anti-Markovnikov-type products.