Reaction of derivatives of ethyl vinyl ether or ketene dithioacetal substituted with alkyl and aryl groups with hydrazine hydrate afforded respective pyrazole derivatives. This on subsequent treatment with α-halosubstituted acyl halide resulted in the respective N-acylated derivative. Reaction of N-acylated derivative with mercaptoheterocyclic compounds in the presence of base resulted in the formation of Sulphur bridged pyrazole derivatives.