Shcherbakov KV, Artemyeva MA, Burgart YV, Saloutin VI, Volobueva AS, Misiurina MA, Esaulkova YL, Sinegubova EO, Zarubaev VV. 7-Imidazolyl-substituted 4'-methoxy and 3',4'-dimethoxy-containing polyfluoroflavones as promising antiviral agents.
J Fluor Chem 2020;
240:109657. [PMID:
33071313 PMCID:
PMC7547832 DOI:
10.1016/j.jfluchem.2020.109657]
[Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2020] [Revised: 10/06/2020] [Accepted: 10/06/2020] [Indexed: 01/28/2023]
Abstract
Synthesis of the new 2-aryl-4-oxo-4H-polyfluorochromen-3-carboxylates as analogs of natural methoxy-containing flavones.
The alternative flavone-5-hydroxyflavone and flavone-coumarin rearrangements of polyfluoroflavones in basic aqueous acetonitrile medium.
New 7-(1H-imidazol-1-yl)-substituted polyfluorinated flavones and coumarins.
Imidazolyl-functionalized flavones as high prospective antiviral agents.
A simple and convenient method for the synthesis of new methyl 2-(4-methoxyphenyl)- and 2-(3,4-dimethoxyphenyl)-4-oxo-4H-polyfluorochromen-3-carboxylates as analogs of natural methoxy-containing flavones is proposed. As a result of their directed modification under basic conditions, 7-imidazolyl-substituted derivatives were obtained. In aqueous-organic medium under basic conditions, 5,6,7,8-tetrafluoro-3-(methoxycarbonyl)flavones were transformed into 6,8-difluoro-5-hydroxy-7-(1H-imidazol-1-yl)-3-(methoxycarbonyl)flavones as a result of flavone-5-hydroxyflavone rearrangement, while 6,7,8-trifluorinated analogs underwent a flavone-coumarin rearrangement to give 6,8-difluoro-3-(hydroxyarylidene)-7-(1H-imidazol-1-yl)coumarins under the same conditions. Acid hydrolysis of methyl polyfluoroflavone-3-carboxylates allowed to obtain 2-aryl-4H-polyfluorochromen-4-ones. Evaluation of the antiviral activity of the synthesized compounds against influenza A (H1N1) and Coxsackie B3 viruses showed that 2-(3,4-dimethoxyphenyl)-5,6,8-trifluoro-7-(1H-imidazol-1-yl)-4H-chromene-4-one has the most promising properties.
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