Journal
BIOORGANIC & MEDICINAL CHEMISTRY
Volume 20, Issue 24, Pages 7155-7159Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.bmc.2012.09.064
Keywords
Adamantane; Spirothiazolidinone; Microwave; Antiviral; Influenza virus; Hemagglutinin
Funding
- Istanbul University Scientific Research Project [BYP-2906, BYP-12603]
- Fonds voor Wetenschappelijk Onderzoek Vlaanderen (FWO) [9.0188.07]
- Geconcerteerde Onderzoeksacties [GOA/10/014]
- KULeuven
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A microwave-assisted three-component one-pot cyclocondensation method was applied for the synthesis of novel N-(1-thia-4-azaspiro[4.5] decan-4-yl)carboxamide compounds carrying an adamantyl moiety. The structures of the compounds were confirmed by spectral and elemental analysis. All compounds were evaluated for antiviral activity against influenza A (H1N1 and H3N2) and influenza B virus in MDCK cell cultures. The compounds displayed a confined structure-activity relationship. The N-(2,8-dimethyl-3-oxo-1-thia-4-azaspiro[4.5] dec-4-yl)adamantane-1-carboxamide 3b was the most potent inhibitor [antiviral EC50: 1.4 mu M against influenza A/H3N2 virus]. Its strong inhibitory effect in a virus hemolysis assay supports that 3b acts as an influenza virus fusion inhibitor by preventing the conformational change of the influenza virus hemagglutinin at low pH. (C) 2012 Elsevier Ltd. All rights reserved.
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