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Synthesis of aromatic carbamates derivatives with a chromen-2-one fragment

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Abstract

Condensation of methyl N-(3-hydroxyphenyl)carbamate with ethyl trifluoromethylacetoacetate, 2-methoxyethyl acetoacetate in the presence of conc. sulfuric acid, and also with acetonedicarboxylic acid formed in situ from citric acid under the action of conc. sulfuric acid afforded chromene derivatives. The esterification of 2-{7-[(methoxycarbonyl)amino]-2-oxo-2H-chromen-4-yl}acetic acid with methanol in the presence of TsOH provided the corresponding ester. The oxidation of its α-methylene group with selenium dioxide led to the formation of methyl 2-{7-[(methoxycarbonyl)amino]-2-oxo-2H-chromen-4-yl}-2-oxo-acetate entering into a condensation with o-phenylenediamine resulting in a derivative with a dihydroquinoxaline fragment. The reaction of phenyl N-(4-formylphenyl)carbamate with 3-acetyl-2H-chromen-2-one in butanol in the presence of catalytic quantity of piperidine and acetic acid furnished 4-[(E)-3-oxo-2H-chromen-3-yl)-1-propenyl]phenyl N-phenylcarbamate.

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Authors and Affiliations

  1. Astrakhan State University, pl. Shaumyana 1, Astrakhan, 414000, Russia

    A. V. Velikorodov, V. A. Ionova, E. A. Melent’eva, N. N. Stepkina & A. A. Starikova

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  1. A. V. Velikorodov
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  2. V. A. Ionova
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  3. E. A. Melent’eva
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  4. N. N. Stepkina
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  5. A. A. Starikova
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Correspondence to A. V. Velikorodov.

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Original Russian Text © A.V. Velikorodov, V.A. Ionova, E.A. Melent’eva, N.N. Stepkina, A.A. Starikova, 2014, published in Zhurnal Organicheskoi Khimii, 2014, Vol. 50, No. 8, pp. 1131–1135.

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Velikorodov, A.V., Ionova, V.A., Melent’eva, E.A. et al. Synthesis of aromatic carbamates derivatives with a chromen-2-one fragment. Russ J Org Chem 50, 1112–1116 (2014). https://doi.org/10.1134/S1070428014080077

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  • DOI: https://doi.org/10.1134/S1070428014080077

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