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Paper | Regular issue | Vol 45, No. 9, 1997, pp.1767-1774
Published online, 1st January, 1970
DOI: 10.3987/COM-97-7882
Synthesis of Hetero[1,2,4]thiadiazine 1,1-Dioxides

M. Esther Arranz, Salvador Vega,* and Juan A. Díaz

*Instituto de Química Médica, C. S. I. C., Calle Juan de Cierva, 3, E-28006 Madrid, Spain

Abstract

The synthesis of several representatives of the new thieno- and pyrazolo[1,2,4]thiadiazine 1,1-dioxides ring systems is described. It was carried out by cyclization of the isocyanates (4) formed in the Curtius rearrangement of acyl azides (3). The reactivity of these new rings towards some electrophilic reagents was also explored.