Iminyl-Radicals by Oxidation of α-Imino-oxy Acids: Photoredox-Neutral Alkene Carboimination for the Synthesis of Pyrrolines
作者:Heng Jiang、Armido Studer
DOI:10.1002/anie.201706270
日期:2017.9.25
α‐imino‐oxy propionic acids for the generation of iminyl radicals has been accomplished through the use of Ir(dFCF3ppy)2(dtbbpy)PF6 as a photoredox catalyst. Different from visible‐light‐promoted homolysis and single‐electron reduction of oxime derivatives, this strategy provides a novel catalytic cycle for alkene carboimination through a sequence comprising N‐radical generation, iminyl radical cyclization,
通过使用Ir(dFCF 3 ppy)2(dtbbpy)PF 6作为光氧化还原催化剂,可以实现α-亚氨基氧丙酸在可见光促进下的脱羧,从而生成亚胺基。与可见光促进的肟衍生物的均质分解和单电子还原不同,该策略通过包括N自由基生成,亚胺基自由基环化,向Michael受体添加分子间共轭物和单个在整个氧化还原中性过程中电子还原以提供各种吡咯啉衍生物。由这种合成方法制备的吡咯啉衍生物可以容易地构建吲哚并立定生物碱骨架。