α-Chlorobenzylation of Nitroarenes via Vicarious Nucleophilic Substitution with Benzylidene Dichloride: Umpolung of the Friedel–Crafts Reaction
作者:Jakub Brześkiewicz、Rafał Loska、Mieczysław Mąkosza
DOI:10.1021/acs.joc.8b01091
日期:2018.8.3
available α,α-dichlorotoluenes enter a vicarious nucleophilic substitution (VNS) reaction with electron-deficient arenes to give α-chlorobenzylated nitrobenzenes, as well as six- and five-membered heterocycles. Oxidation of the initially formed α-chlorobenzylic carbanions instead of protonation results in formation of diaryl ketones, providing a means for overall nucleophilic C–H benzoylation of electron-deficient
现成的α,α-二氯甲苯与缺乏电子的芳烃进行替代性亲核取代(VNS)反应,生成α-氯苄基硝基苯,六元和五元杂环。最初形成的α-氯苄基碳负离子(而不是质子化)的氧化导致二芳基酮的形成,这为缺电子的芳环的整体亲核CH苯甲酰化提供了一种手段。或者,可以通过分离的α-氯二芳基甲烷与叠氮化钠的反应获得苯甲酰化的硝基芳烃。