Photoredox‐ and Nickel‐Catalyzed Hydroalkylation of Alkynes with 4‐Alkyl‐1,4‐dihydropyridines: Ligand‐Controlled Regioselectivity
作者:Yulin Zhang、Yoshiaki Tanabe、Shogo Kuriyama、Yoshiaki Nishibayashi
DOI:10.1002/chem.202200727
日期:2022.6.27
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 catalysts. With [Ir(Fppy)3] (Fppy=3,5-difluor
在可见光照射下,末端炔烃与 4-烷基-1,4-二氢吡啶的双重光氧化还原和镍催化加氢烷基化,以良好至高的产率获得了马尔科夫尼科夫或反马尔科夫尼科夫型烷基化烯烃,其中镍催化剂的配位体有效地控制了产物的区域选择性。以 [Ir(Fppy) 3 ] (Fppy=3,5-difluoro-2-(2-pyridyl)phenyl) 作为光氧化还原催化剂,使用 [NiCl 2 (dtbbpy)] (dtbbpy=4,4'-di- tert -丁基-2,2'-联吡啶)或NiCl 2 ⋅ 6 H 2 O作为镍催化剂分别导致马尔科夫尼科夫型或反马尔科夫尼科夫型产物的选择性形成。