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.
在无
配体、无碱和无
添加剂的条件下,发现
铜-
锌负载于
Al2O3-TiO2上是一种简单而高效的异相
催化剂,可用于以空气作为绿色
氧化剂进行
1,2,4-三唑衍
生物的
氧化合成。异相反应顺利进行,适用范围广泛,包括含
NO2、
乙烯基、
嘧啶和
咪唑的起始材料,并以适中的到优良的收率(1.6摩尔% 的低
催化剂负载)提供了相应的三唑。此外,该
催化剂可以简单
重复回收多次,催化活性未显著下降。