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■ Amino-group Exchange and Ring-cleavage Reactions in Fused 1,2,6-Thiadiazine Dioxide Derivatives

Piedad Fernández-Resa, Pilar Goya, Rosa Nieves, Carmen Ochoa, and Manfred Stud

*Instituto de Química Orgánica General, C. S. I. C., Calle Juan de Cierva, 3, 28006 Madrid, Spain

Abstract

Reactions of 7-amino-4H-furazano[3,4-c][1,2,6]thiadiazine 5,5-dioxide (1) and its 4-methyl derivative (2) with nucleophilic agents under different conditions, are described. Besides the products resulting from the displacement of the 7-amino group, those produced by cleavage of the thiadiazine ring have also been obtained.