REGIOSELECTIVE S→N ALLYLIC TRANSPOSITION OF 3-ALLYLTHIO 1,2,4-TRIAZINONE WITHOUT SOLVENT, AND CATALYST UNDER MICROWAVE IRRADIATION
作者:M. M. Heravi、M. A. Nooshabadi、K. Aghapoor
DOI:10.1080/10426500008045237
日期:2000.1
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 3has 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 cone, sulphuric acid afforded the corresponding 2-methyl thiazolo[2,3-c] triazinone 7.