New Approaches for the Synthesis of 1,3,4-Thiadiazole and 1,2,4-Triazole Derivatives with Antimicrobial Activity
作者:Wagnat W. Wardakhan、Nahed N. E. El-Sayed
DOI:10.1080/10426500802274534
日期:2009.3.10
The thiosemicarbazide derivatives 3a and 3b were cyclized in the presence of concentrated sulfuric acid to give the 5-cyanomethyl-1,3,4-thiadiazole derivatives 4a and 4b , respectively. The latter products were used for many heterocyclic transformations to form coumarin, 1,3,4-thiadiazolo[4,5-a]pyridine, and 5-thiophenylthiophene. In addition, compound 3b underwent cyclization in NaOH (2 N) solution
氨基硫脲衍生物3a和3b在浓硫酸存在下环化,分别得到5-氰基甲基-1,3,4-噻二唑衍生物4a和4b。后一种产物用于许多杂环转化以形成香豆素、1,3,4-噻二唑并[4,5-a]吡啶和5-噻吩噻吩。此外,化合物 3b 在 NaOH (2 N) 溶液中进行环化,得到 1,2,4-三唑衍生物 16。研究了后一种产物对某些化学试剂的反应性。新合成产物的抗菌活性被测定并显示出高活性。