Chemistry of Heterocyclic Compounds p. 805 - 810 (1988)
Update date:2022-07-30
Topics:
Savel'ev, V. L.
Samsonova, O. L.
Troitskaya, V. S.
Vinokurov, V. G.
Lezina, V. P.
Smirnov, L. D.
The reaction of 3,4-diaminocoumarin with thionyl chloride gave 4H-<1>benzopyrano<3,4-c><1,2,5>thiodiazol-4-one (II), which was cleaved by the action of nucleophilic agents to the corresponding 4-(2-hydroxyphenyl)-1,2,5-thiadiazole-3-carboxylic acid derivatives.The nitration of II leads to the 8-nitro or 6,8-dinitro derivative; the latter was isolated in the form of 4-(2-hydroxy-3,5-dinitrophenyl)-1,2,5-thiadiazole-3-carboxylic acid.
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Doi:10.1016/j.tetlet.2009.08.049
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