Cross-Coupling Reactions of Alkenyl Halides with 4-Benzyl-1,4- Dihydropyridines Associated with <i>E</i>
to <i>Z</i>
Isomerization under Nickel and Photoredox Catalysis
作者:Kazunari Nakajima、Xifeng Guo、Yoshiaki Nishibayashi
DOI:10.1002/asia.201801542
日期:2018.12.4
Cross‐coupling reactions of alkenyl halides with 4‐alkyl‐1,4‐dihydropyridines as alkylation reagents have been achieved by combination of nickel and photoredox catalysts. Alkenyl halides bearing alkyl and aryl substituents are available. Particularly, in the use of aryl‐substituted alkenyl halides, cross‐coupling reactions are associated with E to Z isomerization of alkenes. Thus, Z‐isomers of the
镍和光氧化还原催化剂的组合已实现了烯基卤化物与4-烷基-1,4-二氢吡啶作为烷基化试剂的交叉偶联反应。带有烷基和芳基取代基的烯基卤化物是可用的。特别是,在使用芳基取代的烯基卤化物时,交叉偶联反应与烯烃的E到Z异构化有关。因此,产品的Z异构体是主要产品。本策略提供了一种新颖的合成方法来控制烯烃周围的立体化学。