Synthesis of Novel Derivatives of 5-(4,6-Dimethyl-2-Pyrimidinylsulfanyl)methyl-1,2,4-triazole-3-thione

Abstract

Alkylation of 5-(4,6-dimethyl-2-pyrimidinylsulfanyl)methyl-1,2,4-triazole-3-thione (2) with various alkyl halides, 4-chlorophenacyl bromide, chloroacetic acid, and α-chloroacetanilide afforded S-substituted 1,2,4-triazoles (3–11). 3-Carboxymethylsulfanyl-5-(4,6-dimethyl-2-pyrimidinylsulfanyl)methyl-1,2,4-triazole (9), in the presence of acetic anhydride, was cyclized to 6-(4,6-dimethyl-2-pyrimidinylsulfanyl)methylthiazolo[3,2-b][1,2,4]triazol-3(2H)-one (12). The later condensed with aromatic aldehydes to give 6-(4,6-dimethyl-2-pyrimidinylsulfanyl)methyl-6-[(1-aryl)methylidene]thiazolo[3,2-b][1,2,4]triazol-3(2H)-ones (13, 14) and under treatment with aniline underwent ring-disclosure reaction to yield 3-(phenylcarbamoyl)methylsulfanyl-5-(4,6-dimethyl-2-pyrimidinylsulfanyl)methyl-1,2,4-triazole (11).

Keywords:

• Alkylation
• cyclization
• substituted 1,2,4-triazole-3-thiones
• thiazolo[3,2-b]triazolone