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A cannabinoid derived prototypical analgesic.

L S Melvin, M R Johnson, C A Harbert

    Journal of Medicinal Chemistry
    |January 1, 1984
    PubMed
    Summary
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    Researchers synthesized a simpler cannabinoid, compound 1, demonstrating it has equal analgesic potency to morphine. This finding confirms the pyran ring is not essential for cannabinoid biological activity.

    Area of Science:

    • Medicinal Chemistry
    • Pharmacology

    Background:

    • Cannabinoid research has explored structure-activity relationships (SAR) to understand the molecular basis of their effects.
    • Previous SAR studies on 9-nor-9 beta-hydroxyhexahydrocannabinol (HHC) suggested the pyran ring might not be crucial for activity.

    Purpose of the Study:

    • To synthesize and evaluate a simplified cannabinoid analog, compound 1, lacking the HHC pyran ring.
    • To determine if compound 1 retains the analgesic properties of HHC.
    • To investigate further structural simplification for potential therapeutic applications.

    Main Methods:

    • Multi-step synthesis of compound 1 from [3-(benzyloxy)phenyl]acetonitrile.
    • Molecular modeling and mechanics calculations to predict activity.
    • Analgesic testing of compound 1 in five distinct pain models.

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  • Synthesis and testing of a further simplified derivative, compound 17.

    • Main Results:

    • Compound 1 was successfully synthesized in nine steps.
    • In vivo testing revealed compound 1 possesses analgesic potency equivalent to morphine.
    • The pyran ring of HHC is confirmed as non-essential for analgesic activity.
    • A further simplified analog, compound 17, exhibited significantly reduced analgesic effects.

    Conclusions:

    • The simplified cannabinoid analog, compound 1, effectively mimics the analgesic activity of HHC.
    • Structural simplification of HHC is feasible without compromising analgesic efficacy.
    • The pyran ring is not a critical pharmacophore for analgesic activity in this cannabinoid series.