在温和且可扩展的电解条件下,已开发出无金属和无氧化剂的分子内脱氢N–N键的形成。从容易获得的N-(2-吡啶基)am有效地合成了各种有价值的1,2,4-三唑并[1,5- a ]吡啶。反应在恒定电流条件下,在简单的不分隔电池中进行,其中n Bu 4 NBr作为氧化还原介体和电解质。该方案适用于抗糖尿病化合物关键中间体的有效合成。
An efficient and recyclable heterogeneous catalytic system for the synthesis of 1,2,4-triazoles using air as the oxidant
作者:Xu Meng、Chaoying Yu、Peiqing Zhao
DOI:10.1039/c3ra47029f
日期:——
Copper–zinc supported on Al2O3–TiO2 was found as a simple and efficient heterogeneous catalyst for the oxidative synthesis of 1,2,4-triazole derivatives using air as the green oxidant under ligand-, base- and additive-free conditions. The heterogeneous reactions carried out smoothly with a large range of substrates, including NO2-, vinyl-, pyrimidine- and imidazole-contained starting materials, and provided corresponding triazoles in moderate to excellent yields with low catalyst loading (1.6 mol%). Furthermore, the catalyst can be simply recycled many times without significant loss in catalytic activity.