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The Mannich reaction in the synthesis of N,S-containing heterocycles 10. Recyclization of stable cyclic michael adducts, N-methylmorpholinium 6-R-6-hydroxy-1,4,5,6-tetrahydropyridine-2-thiolates, to pyrimido[4,3-b][1,3,5]thiadiazines under conditions of aminomethylation reaction

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Abstract

5-Substituted N-methylmorpholinium 4-aryl-6-R-3-cyano-6-hydroxy-1,4,5,6-tetrahydro-pyridine-2-thiolates upon the action of primary amines and HCHO in ethanol undergo recyclization to 3,7-disubstituted 8-aryl-3,4,7,8-tetrahydro-2H,6H-pyrimido[4,3-b][1,3,5]thiadiazine-9-carbonitriles in low yields (5–28%). The latter were also obtained by alternative method, viz., by sequential condensation of cyanothioacetamide with aromatic aldehydes, primary amines, and HCHO.

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Correspondence to V. V. Dotsenko.

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For Part 9, see Ref. 1.

Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 7, pp. 1436–1440, July, 2009.

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Dotsenko, V.V., Frolov, K.A., Krivokolysko, S.G. et al. The Mannich reaction in the synthesis of N,S-containing heterocycles 10. Recyclization of stable cyclic michael adducts, N-methylmorpholinium 6-R-6-hydroxy-1,4,5,6-tetrahydropyridine-2-thiolates, to pyrimido[4,3-b][1,3,5]thiadiazines under conditions of aminomethylation reaction. Russ Chem Bull 58, 1479–1483 (2009). https://doi.org/10.1007/s11172-009-0199-8

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