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2,1-Benzothiazine 2,2-dioxides 10*. Reaction of alkyl 1-R-4-hydroxy-2,2-dioxo-1Н-2λ6,1-benzothiazine-3-carboxylates with 1H-1,2,4-triazol-5-amine

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Chemistry of Heterocyclic Compounds Aims and scope

The reaction of alkyl 1-R-4-hydroxy-2,2-dioxo-1Н-2λ6,1-benzothiazine-3-carboxylates with 1H-1,2,4-triazol-5-amine in refluxing xylene produced not only 1-R-4-hydroxy-2,2-dioxo-N-(1H-1,2,4-triazol-5-yl)-1H-2λ6,1-benzothiazine-3-carboxamides, but also 6,6-dioxides of 7-R-3H-[1,2,4]triazolo[5',1':2,3]pyrimido[5,4-c][2,1]benzothiazin-5(7H)-ones.

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Correspondence to Igor V. Ukrainets.

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Translated from Khimiya Geterotsiklicheskikh Soedinenii, 2015, 51(1), 97–101

* For Communication 9, see.1

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Ukrainets, I.V., Petrushova, L.A., Sim, G. et al. 2,1-Benzothiazine 2,2-dioxides 10*. Reaction of alkyl 1-R-4-hydroxy-2,2-dioxo-1Н-2λ6,1-benzothiazine-3-carboxylates with 1H-1,2,4-triazol-5-amine. Chem Heterocycl Comp 51, 97–101 (2015). https://doi.org/10.1007/s10593-015-1665-x

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