Multibond Forming Tandem Reactions of Anilines via Stable Aryl Diazonium Salts: One-Pot Synthesis of 3,4-Dihydroquinolin-2-ones
作者:Réka J. Faggyas、Megan Grace、Lewis Williams、Andrew Sutherland
DOI:10.1021/acs.joc.8b01910
日期:2018.10.19
A fast and effective one-pot tandem process that generates Heck coupled products from readily available anilines via stable aryl diazonium tosylate salts was developed. The mild and simple procedure involves rapid formation of aryl diazonium salts using a polymer-supported nitrite reagent and p-tosic acid, followed by a base-free Heck–Matsuda coupling with acrylates and styrenes. Using 2-nitroanilines
开发了一种快速有效的一锅串联方法,该方法可通过稳定的芳基重氮甲苯磺酸盐从易于获得的苯胺生成Heck偶联产物。温和而简单的步骤涉及使用聚合物负载的亚硝酸盐试剂和对羟基苯甲酸酯快速形成芳基重氮盐-甲苯磺酸,然后与丙烯酸酯和苯乙烯进行无碱Heck-Matsuda偶联。使用2-硝基苯胺作为底物,将一锅串联方法扩展到直接合成3,4-二氢喹啉-2-酮。在这种情况下,经过重氮化和Heck-Matsuda偶联生成肉桂酸甲酯,添加氢气并再利用钯催化剂还原硝基和烯烃氢化,可有效形成3,4-二氢喹啉-2-酮。 。一锅四步法的合成效用通过基于喹啉酮的钠离子通道调节剂的五锅法合成得到了证明。