Synthesis and anti-inflammatory activities of novel 5-(3,4-dichlorophenyl)- 3-[(4-substitutedpiperazin-1-yl)methyl]-1,3,4-oxadiaxole-2(3H)-thiones

Abstract

Purpose: To synthesize a new series of 5-(3,4-dichlorophenyl)-3-[(4- substitutedpiperazin-1-yl)methyl]-1,3,4-oxadiaxole-2-thiones for their anti-inflammatory activity. Methods: The title compounds synthesized by Mannich reaction of prepared 5-(3,4-dichloroÂphenyl)-1,3,4-oxadiazole-2-thione and appropriate substituted piperazine derivatives. The structures of the compounds were confirmed by IR, NMR and elemental analyses. The newly synthesized compounds were evaluated for their anti-inflammatory and ulcerogenic activities. Results: Most of the compounds were found to have significant anti-inflammatory profile in carrageenan footpad edema test. The compounds showed anti-inflammatory activity ranging from 30.6% to 57.8% inhibition. Conclusion: The compounds 5b, 5f, 5i, 5p and 5r showed most prominent anti-inflammatory activity with low gastric ulceration incidence than the reference drug indomethacine. These compounds could serve as lead molecules for further modifications. © Georg Thieme Verlag KG Stuttgart, New York.