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Abstract
The facile and regioselective cyclization of 3-allylsulfanyl-6-methyl-2H-[1,2,4-]triazin-5-one 2 to 3,6-dimethyl-2,3-dihydro-thiazolo [3,2-.b.][1,2,4] triazin-7-one 3 has been performed by the catalytic action of H2SO4. Compound 2 underwent [3,3] sigmatropic shift under microwave irradiation to afford 4N allyl derivative 5 in fairly good yield. Treatment of 5 with conc, sulphuric acid afforded the corresponding 2-methyl thiazolo[2,3-c] triazinone 7.