Oxidative Cross-Coupling of Substituted Phenols with Unactivated Aromatics
作者:Nagnath Yadav More、Masilamani Jeganmohan
DOI:10.1002/ejoc.201700666
日期:2017.8.10
C–H arylation of substituted phenols or naphthols with substituted aromatics in the presence of K2S2O8 and Bu4N+·HSO4– in CF3COOH at ambient temperature providing unsymmetrical biaryls is described. The cross-coupling reaction is compatible with various substituted phenols and aromatics. Based on oxidation potential studies, it was observed that phenols with oxidation potentials up to 0.68 V and naphthols
描述了在环境温度下在 CF3COOH 中,在 K2S2O8 和 Bu4N+·HSO4– 存在下,取代苯酚或萘酚与取代芳烃的区域选择性 C-H 芳基化反应,提供不对称的联芳基化合物。交叉偶联反应与各种取代苯酚和芳烃相容。根据氧化电位研究,观察到氧化电位高达 0.68 V 的酚和高达 0.88 V 的萘酚与反应相容。交叉偶联反应通过 K2S2O8 与取代苯酚的反应进行,提供阳离子苯酚自由基中间体,该中间体通过 H+ 的解离进一步转化为苯氧基自由基中间体。随后苯氧基自由基中间体与取代芳烃的自由基-阴离子偶联提供交叉偶联产物。