A Redox‐Active Nickel Complex that Acts as an Electron Mediator in Photochemical Giese Reactions
作者:Thomas van Leeuwen、Luca Buzzetti、Luca Alessandro Perego、Paolo Melchiorre
DOI:10.1002/anie.201814497
日期:2019.4
report a simple protocol for the photochemical Giese addition of C(sp3)‐centered radicals to a variety of electron‐poor olefins. The chemistry does not require external photoredox catalysts. Instead, it harnesses the excited‐state reactivity of 4‐alkyl‐1,4‐dihydropyridines (4‐alkyl‐DHPs) to generate alkyl radicals. Crucial for reactivity is the use of a catalytic amount of Ni(bpy)32+ (bpy=2,2′‐bipyridyl)
我们报告了一种简单的方案,用于将 C(sp 3 ) 中心自由基光化学吉斯加成到各种贫电子烯烃上。该化学不需要外部光氧化还原催化剂。相反,它利用 4-烷基-1,4-二氢吡啶(4-烷基-DHP)的激发态反应性来生成烷基。反应性的关键是使用催化量的 Ni(bpy) 3 2+ (bpy=2,2′-联吡啶),它充当电子介体,促进涉及短暂且高反应性中间体的氧化还原过程。