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3-Alkylamino-pyrido[4,3-e]-1,2,4-thiadiazine 1,1-dioxide represents a new class of heterocyclic compounds expressing important pharmacological properties. According to the position of the C=N double bond in the thiadiazine ring, this heterocyclic ring system may exist under three different tautomeric forms. By means of spectral and X-ray data collected from selected compounds, the most favourable...
1,1 -Thiocarbonyldiimidazole was used as a ring closure agent for o-aminoarylsulfonamides. Beside the formation of the expected 3-thioxo-2,3-dihydro-4H-1,2,4-arylthiadiazine 1,1-dioxide derivatives, a new kind of compound was also obtained, namely the 3-(imidazol-1-yl)-4H-1,2,4-arylthiadiazine 1,1-dioxides. The latter appeared to be good reaction intermediates. The use of 1,1 -thiocarbonyldiimidazole...
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