Synthesis of 4‐(pyrazol‐5‐yl)‐1,2,4‐triazole‐3‐thiones

Abstract

Abstract Condensation of pyrazolyl isothiocyanates 2 with N ‐substituted hydrazines provided the 2‐methyl/phenyl‐4‐(pyrazol‐5‐yl)thiosemicarbazides 3 . Cyclization of 3 with formic acid‐acetic anhydride or with triethyl orthoacetate‐acetic anhydride provided 4‐(pyrazol‐5‐yl)‐l,2,4‐triazole‐3‐thiones 4a‐f and 5‐methyl‐4‐(pyrazol‐5‐yl)‐1,2,4‐triazole‐3‐thiones 4g‐I respectively.