The reaction of acetic or propionic acid hydrazides with various aryl/alkyl isothiocyanates gave thiosemicarbazides which furnished the 1,2,4-triazoles by alkali cyclization. The 4-aryl/alkyl-5-(1-phenoxyethyl)-3-[N-(substituted) acetamido]thio-4H-1,2,4-triazole derivatives were synthesized by reacting the triazoles with 2-chloro-N-(substituted)acetamide. The chemical structures of the compounds were elucidated by IR, 1H-NMR, FAB+-MS spectral data and elemental analysis. In the pharmacological studies, anti-inflammatory activities of these compounds have been screened and significant activities were observed. © 2007 Wiley-VCH Verlag GmbH & Co. KGaA.