Synthesis and biological activity of some new 1,3,4-thiadiazole and 1,2,4-triazole compounds containing a phenylalanine moiety

Abstract

New 1,3,4-thiadiazole, 6, 7 and 1,2,4-triazole derivatives, 8, 9 containing a phenylalanine moiety have been synthesized by intramolecular cyclization of 1,4- disubstituted thiosemicarbazides, 4, 5, in acid and alkaline media, respectively; the thiosemicarbazides were obtained by reaction of hydrazide 3 with appropriate aromatic isothiocyanates. The toxicity of the synthesized compounds was evaluated and the antiinflammatory study of the triazole compound 9 established an appreciable antiinflammatory activity that is comparable with that of other nonsteroidal anti-inflammatory agents. © 2009 by the authors; licensee Molecular Diversity Preservation International, Basel, Switzerland.