Abstract
A series of some new 1,3,4-oxadiazole-2-thiol derivatives (6a-h) containing cyclic secondary amine such as piperidine ring was expeditiously synthesized by alkylation of 1,3,4-oxadiazol-2-thiol derivatives with chloroethyl piperidine hydrochloride. The 1,3,4-oxadiazole-2-thiols were effectively synthesized by cyclization reaction of acid hydrazide derivatives with carbon disulfide. The target compounds 6a-h were preliminarily screened for in vitro antioxidant activities using various in vitro antioxidant assays including 2,2'-diphenyl-1-picrylhydrazyl, nitric oxide, and hydrogen peroxide methods. The results showed that the compounds exhibited promising antioxidant property in the three methods at 50, 75, and 100 mu M. Among the tested compounds, the compounds 6a and 6b having chloro substituent in the benzene ring displayed greater radical scavenging activity.
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