Novel and Efficient Synthesis of 4‐Substituted‐1,2,4‐triazolidine‐3,5‐diones from Anilines
作者:Shadpour Mallakpour、Zahra Rafiee
DOI:10.1080/00397910701316862
日期:2007.6.1
the preparation of 4‐substituted phenyl derivatives of 1,2,4‐triazolidindiones (urazoles), starting from anilines, has been developed. In this method, aniline derivatives were reacted with 4‐nitrophenyl chloroformate to provide corresponding carbamate derivatives. In the second step, semicarbazide derivatives were prepared from these carbamates by reaction with ethyl carbazate. The cyclization reaction
摘要 开发了一种以苯胺为原料制备 1,2,4-三唑烷二酮 (urazole) 的 4-取代苯基衍生物的简单有效的三步合成方法。在该方法中,苯胺衍生物与氯甲酸 4-硝基苯基酯反应生成相应的氨基甲酸酯衍生物。在第二步中,通过与氨基甲酸乙酯反应,由这些氨基甲酸酯制备氨基脲衍生物。相应氨基脲的环化反应以高产率提供了 1,2,4-三唑烷二酮。