Synthesis of novel heterocycles using 1,2,3‐triazole‐4‐carbohydrazides as precursors
作者:Hanan A. Mohamed、Rizk E. Khidre、Benson M. Kariuki、Gamal A. El‐Hiti
DOI:10.1002/jhet.3840
日期:2020.3
4‐acetyl‐1,2,3‐triazoles in boiling ethanol containing glacial acetic acid. Reaction of one of the 4‐carbohydrazides with carbon disulfide, followed by the reaction with hydrazine hydrate, gave 4H‐1,2,4‐triazole‐3‐thiol in 73% yield, which further reacted with other α‐bromoketones in boiling ethanol to afford 7H‐[1,2,4]triazolo[3,4‐b][1,3,4]thiadiazines in 82‐84% yields. Additionally, reactions of certain
本文中,我们报告了使用高效简单的方法,通过酰肼与市售试剂的反应合成包含1,2,3-三唑的各种杂环系统。沸腾的乙醇中某些1,2,3-三唑-4-碳酰肼和α-溴代酮的反应提供了相应的,而不是预期的三嗪。involved还可以通过另一种途径合成,其产率为85-90%,该途径涉及1,2,3-三唑-4-碳酰肼和4-乙酰基1,2,3-三唑在沸腾的含冰醋酸的乙醇中反应酸。4-碳酰肼之一与二硫化碳反应,然后与水合肼反应,得到4 H‐1,2,4-三唑-3-硫醇,收率73%,可在沸腾的乙醇中与其他α-溴酮进一步反应,得到7 H- [1,2,4]三唑[3,4- b ] [1 ,3,4]噻二嗪的产率为82-84%。此外,某些碳酰肼与2-氰基-3-3,3-二(甲硫基)丙烯酸乙酯反应生成1-芳基-1 H -1,2,3-三唑-4-碳酰肼,而不是预期的1 H-吡唑-4羧酸盐。