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 thiosemicarbazidederivatives 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