A convenient new synthetic approach to 3-aryl-1,2,4-triazoles has been developed. Chloralamides were obtained by high yield reactions between benzamides and chloral hydrate. These reacted with a phosphorus pentachloride/phosphorus oxychloride mixture undergoing a near quantitative conversion to N-(1,2,2,2-tetrachloroethyl)benzimidoyl chlorides, which were treated with hydrazine hydrate to directly
已经开发了一种方便的合成3-芳基-
1,2,4-三唑的新方法。
氯酰胺是通过苯甲酰胺和
水合氯醛之间的高收率反应获得的。它们与
五氯化磷/三
氯氧化
磷混合物反应,几乎定量转化为N用
水合
肼处理-(1,2,2,2-四
氯乙基)
苯甲酰氯,以高产率到定量产率直接得到3-芳基-
1,2,4-三唑。这些产物的形成涉及双重缩合过程,然后是
氯仿的自发β-消除。通过X射线晶体学测定1-(4-
氯苯甲酰基)-3-(4-
甲氧基苯基)-1,2,4-三唑的分子结构。通过从头算,密度泛函进行了通过
氯仿消除3-芳基-5-三
氯甲基-
1,2,4-三唑啉芳构化并确定3-苯基-
1,2,4-三唑互变异构体的相对稳定性的理论计算研究(B3LYP),Moller–Plesset(MP2)和热
化学配方T1。