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Structure of warfarin in solution

E J Valente, E C Lingafelter, W R Porter

    Journal of Medicinal Chemistry
    |November 1, 1977
    PubMed
    Summary
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    Warfarin exists in solution as three interconverting tautomers: two cyclic hemiketals and a minor open-chain form. Researchers determined the configurations and conformations of these warfarin structures using NMR spectroscopy.

    Area of Science:

    • Medicinal Chemistry
    • Organic Chemistry
    • Structural Chemistry

    Background:

    • Warfarin is a widely used anticoagulant.
    • Understanding the solution-state structure of warfarin is crucial for its pharmaceutical development and efficacy.
    • Previous studies have not fully elucidated the tautomeric equilibrium and stereochemistry of warfarin in solution.

    Purpose of the Study:

    • To identify and characterize the different tautomeric forms of warfarin in solution.
    • To assign the absolute configurations and major conformations of the identified warfarin tautomers.
    • To provide a detailed structural understanding of warfarin relevant to its pharmacological activity.

    Main Methods:

    • Nuclear Magnetic Resonance (NMR) spectroscopy was employed to analyze warfarin in solution.

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  • Analysis included detailed examination of chemical shift and coupling constant parameters.
  • Comparison with structurally fixed model compounds aided in configuration assignments.

    • Main Results:

    • Warfarin in solution exists as an equilibrium mixture of three tautomers.
    • Two major tautomers identified as cyclic diastereomeric hemiketals.
    • A third, minor tautomer identified as the open-chain intermediate form.
    • Configurations and major conformations of all tautomers were assigned.

    Conclusions:

    • The study successfully characterized the solution-state tautomerism of warfarin.
    • The assigned configurations and conformations provide critical structural insights.
    • This detailed structural information can inform future drug design and optimization of warfarin-based therapies.