Catalyst-Free Regioselective N2 Arylation of 1,2,3-Triazoles Using Diaryl Iodonium Salts
摘要:
The widespread application of 1,2,3-triazoles in pharmaceuticals has resulted in substantial interest toward developing efficient postmodification methods. Whereas there are many postmodification methods available to obtain N-1-substituted 1,2,3-triazoles, developing a selective and convenient protocol to synthesize N-2-aryl-1,2,3-triazoles has been challenging. We report a catalyst-free and regioselective method to access N-2-aryl-1,2,3-triazoles in good to excellent yields (66-97%). This scalable postmodification protocol is effective for a wide range of substrates.
Simple and Efficient One‐Pot Synthesis of 2,4‐Diaryl‐1,2,3‐triazoles
作者:Wen‐Jie Tang、Yong‐Zhou Hu
DOI:10.1080/00397910600781216
日期:2006.8.1
Abstract A general and efficient method for the preparation of 2,4‐diaryl‐1,2,3‐triazoles fromα‐hydroxyacetophenones and phenylhydrazines is reported. The essential characteristics of this method include mild reaction conditions, a straightforward workup procedure, and comparatively higher yields.
A Novel and Efficient Strategy for the Preparation of 2,4-Disubstituted-1,2,3-triazoles
作者:Yun Luo、Yongzhou Hu
DOI:10.1081/scc-120024731
日期:2003.10
Abstract We have developed a novel and efficient method for the preparation of 2,4-disubstituted-1,2,3-triazoles. These compounds 3a–3p were synthesized in good yield by refluxing α-aminoacetophenones and hydrazines in glacial acetic acid. The reaction proceeds under mild conditions and is compatible with various functional groups.
The reactions of α‐bromoacetophenones with methylhydrazine in refluxing acetic acid generated 2‐methyl‐4‐aryl‐2H‐[1,2,3]triazoles in good yields. The method was developed by the reactions of α‐bromoacetophenones with phenylhydrazines in the presence of cupric ion, leading to 2,4‐diary‐2H‐[1,2,3]triazoles. The structures were established on the basis of corresponding IR, 1H NMR, and elemental analysis data.