Ligand-free copper(0) catalyzed direct C–H arylation of 1,2,4-triazoles and 1,3,4-oxadiazoles with aryl iodides in PEG-400
作者:Ramu Tadikonda、Mangarao Nakka、Srinuvasarao Rayavarapu、Siva Prasada Kumar Kalidindi、Siddaiah Vidavalur
DOI:10.1016/j.tetlet.2014.12.064
日期:2015.1
A ligand-free copper catalyzed approach has been developed to the synthesis of 3,4,5-triaryl-1,2,4-triazoles and 2,5-diaryl-1,3,4-oxadiazoles by the direct arylation of corresponding 3,4-diaryl-1,2,4-triazoles and 2-aryl-1,3,4-oxadiazoles with aryl iodides using PEG-400 as reaction medium. The procedure is experimentally simple and free from addition of external chelating ligands or co-catalysts.
已开发出无配体的铜催化方法,用于通过相应的3的直接芳基化反应合成3,4,5-三芳基-1,2,4-三唑和2,5-二芳基-1,3,4-恶二唑使用PEG-400作为反应介质的1,4-二芳基-1,2,4-三唑和2-芳基-1,3,4-恶二唑与芳基碘化物。该过程在实验上是简单的,并且没有添加外部螯合配体或助催化剂。