Synthesis of 3-(tri/difluoromethyl)-1<i>H</i>-1,2,4-triazol-5(4<i>H</i>)-ones <i>via</i> the cyclization of hydrazinecarboxamides with tri/difluoroacetic anhydride
作者:Yi You、Yueji Chen、Chenhui You、Junwen Wang、Zhiqiang Weng
DOI:10.1039/c9ob01865d
日期:——
An efficient method for the synthesis of structurally diverse 4-aryl-3-(tri/difluoromethyl)-1H-1,2,4-triazol-5(4H)-ones through the cyclization of hydrazinecarboxamides with tri/difluoroacetic anhydride is presented. The method is simple and environmentally benign, providing tri/difluoromethylated 1,2,4-triazol-5(4H)-ones in moderate-to-good yields. A mechanism is proposed to proceed via a tandem reaction
提出了一种通过肼羧酰胺与三/二氟乙酸酐环化合成结构多样的4-芳基-3-(三/二氟甲基)-1H-1,2,4-三唑-5(4H)-的有效方法。该方法简单且对环境无害,可以以中等至良好的产率提供三/二氟甲基化的1,2,4-三唑-5(4H)-一。提出了通过三/二氟乙酰化,亲核加成和水消除的串联反应进行的机制。这些化合物中的一些表现出有希望的杀虫活性。