Fluorine containing heterocyclic compounds: Synthesis of 6-substituted-2-substituted-aryl-1,2,4-triazolo[5,1-b] 1,3,5-thiadiazin-7-one derivatives

A group of heterocylic compounds of condensed triazole-thiadiazinone derivatives containing fluorine (IIIa-h) were obtained in good yields by the reactions of the corresponding 3-aryl-5-mercapto-1,2,4-triazole (IIa-d) with N-substituted-N-chloromethyl carbamoyl chloride (I) in the presence of potassium carbonate in N,N-dimethylformamide at room temperature. Cyclization of 3-(2,3,5-trifluoro-4-methoxyl)phenyl-5-mercapto-1,2,4-triazole (IIe) with I was difficult due to an intermolecular hydrogen bond of IIe. The structures of the compounds synthesized were confirmed by IR, MS, ¹H NMR and elemental analyses. Fungicidal and insecticidal activities of these compounds were also studied.