This study describes the reduction of 4-methyl- and 4-phenyl-3-(methylsulfonyl)pyrazolo[5,1-c][1,2,4]triazines and 3-[(4-methylphenyl)sulfonyl]pyrazolo[5,1-c][1,2,4]triazines, which were obtained by reactions of pyrazole-3(5)-diazonium salts with the appropriate β-ketosulfones. The interaction of sulfonyl derivatives of pyrazolo[5,1-c][1,2,4]triazines with sodium dithionite or thiourea 1,1-dioxide under mild conditions resulted in chemospecific partial reduction of the as-triazine ring. The configuration of the obtained pyrazolo[5,1-c][1,2,4]triazine dihydro derivatives was established by X-ray structural analysis.
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This study was supported by a grant from the Russian Science Foundation (project No. 15-13-10007).
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, 2017, 53(10), 1128–1133
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Ledenyova, I.V., Kartavtsev, P.A., Shikhaliev, K.S. et al. Chemospecific reactions of as-triazine ring reduction in sulfonyl derivatives of pyrazolo[5,1-c][1,2,4]triazines. Chem Heterocycl Comp 53, 1128–1133 (2017). https://doi.org/10.1007/s10593-017-2183-9
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DOI: https://doi.org/10.1007/s10593-017-2183-9