Oxidative Cross-Coupling of Two Different Phenols: An Efficient Route to Unsymmetrical Biphenols
作者:Nagnath Yadav More、Masilamani Jeganmohan
DOI:10.1021/acs.orglett.5b01324
日期:2015.6.19
An efficient synthesis of unsymmetrical biphenols via the oxidative cross-coupling of two different phenols in the presence of K2S2O8 and Bu4N+.HSO3- (10 mol %) in CF3COOH at ambient conditions is described. 1:1 Cross-coupling of substituted phenols with naphthols and 1:2 cross-coupling of naphthols with phenol are also disclosed. By using Bu4N+.HSO3-, the homocoupling of phenols or naphthols was controlled. In these reactions, the ortho C-H bond of two different phenols and the ortho and para C-H bond of phenols were coupled together.
Electrocatalytic Synthesis of Non‐Symmetric Biphenols Mediated by Tri(<i>p</i>‐bromophenyl)amine: Selective Oxidative Cross‐Coupling of Different Phenols and Naphthols
作者:Qing‐Qing Wang、Yang‐Ye Jiang、Cheng‐Chu Zeng、Bao‐Guo Sun
DOI:10.1002/cjoc.201800560
日期:2019.4
An efficient electrochemical access to the non‐symmetricbiphenols using tri(p‐bromophenyl)amine (TBPA) as a redox mediator has been developed. The electrochemical protocol features highly selectivecross‐coupling products in up to 83% yield, instead of forming homo‐coupling ones.