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.
PhI(OAc)2-Mediated Regioselective Synthesis of 5-Guanidino-1,2,4-thiadiazoles and 1,2,4-Triazolo[1,5-a]pyridines via Oxidative N–S and N–N Bond Formation
construction of biologically important 5-guanidino-1,2,4-thiadiazole and 1,2,4-triazolo[1,5-a]pyridine derivatives has been developed. This new protocol involves the phenyliodine(III) diacetate [PhI(OAc)2]-mediated oxidative cyclization of thioureas/2-aminopyridines and imidates via N–S and N–N bond formation at ambient temperature. This method furnishes the versatile 5-guanidino-1,2,4-thiadiazoles and 1
A green polyol approach for the synthesis of Cu<sub>2</sub>O NPs adhered on graphene oxide: a robust and efficient catalyst for 1,2,4-triazole and imidazo[1,2-<i>a</i>]pyridine synthesis
作者:Shelly Kujur、Shruti Verma、Akash Kumar、Richa Sharma、Devendra Deo Pathak
DOI:10.1039/d2nj00831a
日期:——
method” is reported for the synthesis of Cu2O nanoparticles (NPs) immobilized on graphene oxide (Cu2O-GO), for the first time. The composition of the synthesised composite was characterized by FT-IR, Raman, PXRD, FESEM, high-resolution TEM, XPS, TGA and ICP-MS analysis. Its catalytic application, as a novel heterogeneous catalyst, has been investigated in the solvent-free synthesis of a series of pharmaceutically
首次报道了一种绿色“多元醇法”用于合成固定在氧化石墨烯 (Cu 2 O-GO)上的 Cu 2 O 纳米粒子 (NPS) 。通过FT-IR、Raman、PXRD、FESEM、高分辨率TEM、XPS、TGA和ICP-MS分析对合成的复合材料的组成进行了表征。其作为一种新型非均相催化剂的催化应用已被研究用于无溶剂合成一系列药学上重要的含氮杂环,即。1,2,4-三唑和咪唑[1,2- a]吡啶。该复合材料显示出广泛的底物范围和广泛的官能团弹性。这种绿色方法涉及使用廉价的反应物、适中的温度和无溶剂条件,并提供出色的产品收率。该复合材料通过过滤从反应混合物中回收,并且可以重复使用多达五个循环,而其对两个反应的催化活性都没有任何明显损失。