Acta Cryst. (2005). E61, o2694-o2695  [ doi:10.1107/S1600536805022713 ]

Methyl 2-(3,5-dichlorophenyl)-5-dimethylamino-3-methyl-1,1-dioxo-1,2,3,4-tetrahydro-1⁶,2,4,6-thiatriazine-3-carboxylate

P. J. Duggan, G. D. Fallon and A. J. Liepa

Abstract: The title compound, C₁₃H₁₆Cl₂N₄O₄S, was formed by base-assisted N-alkylation of [2-(3,5-dichlorophenyl)-1,1-dioxo-2,3-dihydro-1H-1⁶-1,2,3,5-thiatriazol-4-yl]dimethylamine with methyl 2-bromopropanoate, followed by a novel base-promoted ring-expansion reaction, to form a relatively rare 1,1-dioxo-1,2,4,6-thiatriazine. The thiatriazine heterocycle adopts an envelope conformation. In the crystal structure, adjacent molecules are linked by an N-HO hydrogen bond to form chains parallel to the a direction.

Online 23 July 2005

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