A method for the synthesis of 4-substituted derivatives of 10,10-dioxo-10λ6-phenoxathiin-2,8-dicarboxylic acid by the reaction of 4,4'-oxydibenzoic acid with strong sulfur-containing electrophiles was developed. The interaction with chlorosulfonic acid or oleum was shown to produce a phenoxathiin ring by initial substitution of hydrogen at positions 2 and 2' followed by intramolecular cyclization to 4-chlorosulfonyl(sulfo)-10,10-dioxo-10λ6-phenoxathiin-2,8-dicarboxylic acid. Using an analogous approach, methods for the synthesis of 4-nitro- and 4,6-dinitro-10,10-dioxo-10λ6-phenoxathiin-2,8-di-carboxylic acids were developed.
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*Dedicated to Professor Gunars Duburs on the occasion of his 80th birthday.
Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1596–1603, October, 2014.
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Yashchenko, V.S., Pap, A.A., Kalechits, G.V. et al. Synthesis of 10,10-Dioxo-10λ6-Phenoxathiin Derivatives by Reaction of 4,4'-Oxydibenzoic Acid with Sulfur-Containing Electrophiles*. Chem Heterocycl Comp 50, 1471–1477 (2015). https://doi.org/10.1007/s10593-014-1612-2
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DOI: https://doi.org/10.1007/s10593-014-1612-2