The direct arylation of N‐substituted o‐bromobenzanilides and benzenesulfonamides via CH bond functionalization has been developed using very low catalyst loadings. This novel cost‐effective and more sustainable method relies on a PCN‐type palladium pincer complex as a highly active palladium source, providing a general and efficientaccess to phenanthridinones, biaryl sultams and related heterocyclic
Palladium-Catalysed Intramolecular Direct Arylation of 2-Bromobenzenesulfonic Acid Derivatives
作者:Charles Beromeo Bheeter、Jitendra K. Bera、Henri Doucet
DOI:10.1002/adsc.201200793
日期:2012.12.14
arylation of 2-bromobenzenesulfonic acid derivatives was found to proceed using 1 mol% of palladiumacetate as the catalyst. The influence of the substituents on the phenol moiety of 2-bromobenzenesulfonic acid phenyl esters reveals that electron-donating substituents favour the reaction while electron-withdrawing ones are unfavourable. The reactivity of sulfonamides was also studied and, in all cases
Sulfoxylate Anion Radical-Induced Aryl Radical Generation and Intramolecular Arylation for the Synthesis of Biarylsultams
作者:Joydev K. Laha、Pankaj Gupta
DOI:10.1021/acs.joc.1c03031
日期:2022.3.18
Aryl radical generation from the corresponding aryl halides using an electron donor and subsequent intramolecular cyclization with arenes could be an important advancement in contemporary biaryl synthesis. A green and practically useful synthetic protocol to access diverse six- and seven-membered biarylsultams especially with a free NH group including demonstration of a gram-scale synthesis is reported
使用电子供体从相应的芳基卤化物生成芳基自由基,然后与芳烃进行分子内环化,可能是当代联芳基合成的重要进步。本文报道了一种绿色且实用的合成方案,用于获取各种六元和七元联芳基磺胺类化合物,尤其是具有游离 NH 基团的化合物,包括克级合成的演示。次硫酸根阴离子自由基 (SO 2 –• ),由试剂雕白粉或连二亚硫酸钠 (Na 2 S 2 O 4),被发现是从芳基卤化物形成芳基自由基的关键单电子转移剂,其在分子内芳基化后得到具有良好至优异产率的联芳基磺胺。该方法的特点是产生仍未开发的芳基自由基,使用廉价且易于获得的工业试剂,以及无过渡金属、温和和绿色的反应条件。