Abstract
Two pairs of oligomeric coumarin enantiomers, spirotriscoumarin A [(+)-1 and (-)-1] and spirotriscoumarin B [(+)-2 and (-)-2], with a spirodienone-sesquiterpene fused skeleton were isolated from Toddalia asiatica. Their structures were unambiguously established using spectroscopic data, X-ray diffraction analysis, and the electronic circular dichroism (ECD) method. The racemic mixtures (±)-1 and (±)-2 exhibit 3-to-6-fold stronger antiviral activity against influenza virus A (H3N2) (IC50: 3.13 and 2.87 μM, respectively) than their corresponding optically pure enantiomers.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Animals
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Antiviral Agents / chemistry
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Antiviral Agents / isolation & purification*
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Antiviral Agents / pharmacology
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Cell Survival / drug effects
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Coumarins / chemistry
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Coumarins / isolation & purification*
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Coumarins / pharmacology
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Cytopathogenic Effect, Viral
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Dogs
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Influenza A Virus, H3N2 Subtype / drug effects
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Madin Darby Canine Kidney Cells
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Molecular Structure
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Plant Bark / chemistry
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Plant Stems / chemistry
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Rutaceae / chemistry*
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Sesquiterpenes / chemistry
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Sesquiterpenes / isolation & purification*
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Sesquiterpenes / pharmacology
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Spiro Compounds / chemistry
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Spiro Compounds / isolation & purification*
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Spiro Compounds / pharmacology
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Stereoisomerism
Substances
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Antiviral Agents
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Coumarins
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Sesquiterpenes
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Spiro Compounds