名称:
Synthesis and Antibacterial Activity of Substituted Thiosemicarbazides and of 1,3,4-Thiadiazole or 1,2,4-Triazole Derivatives
摘要:
The synthesized series of new thiosemicarbazide derivatives (1, 6-10) in reactions with carbon disulphide produced, according to the reaction conditions, the dithioacids (4, 30) or the 5-substituted 1,3,4-thiadiazolo-2-thiol derivatives (2, 27). The dithioacids were cyclized, in the reaction with hydrazine, into the 4ami-no-1,2,4-triazolo-2-thiol derivatives (5, 31). One of these compounds (31) was transformed into the 1,2,4-triazolo-1,3,4-thiadiazine derivative (33). The compounds 6-9 were also exposed to the condensation with aldehydes. 4-phenylpiperazinocarbothiohydrazide (6) was exposed to the action of isothiocyanates, which gave the compounds 16-20, and these cyclized to the 1,3,4-thiadiazoloamino derivatives (21-23).The susceptibility of aerobic and anaerobic bacteria to some of the new derivatives were tested. The anaerobes were the most susceptible at concentrations in ranges less than 6.2 to 100 mu g/mL to derivative: 9 (64% were susceptible), 1, 13 (for 60%), and 7 (for 56%).