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Antimicrobial activity of basic cholane derivatives, VIII.

A M Bellini, M P Quaglio, E Mencini

    Archiv Der Pharmazie
    |December 1, 1989
    PubMed
    Summary

    Researchers synthesized novel deoxycholic acid derivatives with varying substituents. Modifications at C-3 significantly enhanced antimicrobial activity against Gram-positive bacteria, yeast, and fungi, linked to substituent hydrophobicity.

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    Area of Science:

    • Medicinal Chemistry
    • Organic Synthesis
    • Antimicrobial Agents

    Background:

    • Deoxycholic acid, a bile acid, serves as a versatile scaffold for drug development.
    • Exploring novel steroid derivatives for therapeutic applications is an ongoing area of research.
    • Antimicrobial resistance necessitates the development of new classes of antimicrobial agents.

    Purpose of the Study:

    • To synthesize and characterize two novel series of deoxycholic acid derivatives.
    • To evaluate the antimicrobial activity of these synthesized compounds.
    • To investigate the structure-activity relationship, particularly the role of substituents at C-3 and C-24.

    Main Methods:

    • Synthesis of 3,12-dioxo-5 beta-cholan-24-N-substituted amides.
    • Reductive amination to generate 3 beta-amino and 3 beta-N-alkylamino derivatives.

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  • Antimicrobial susceptibility testing against Gram-positive and Gram-negative bacteria, yeast, and fungi.

    • Main Results:

    • The first series of compounds exhibited moderate antimicrobial activity.
    • The second series, featuring 3 beta-amino and 3 beta-N-alkylamino substituents, demonstrated significantly enhanced activity against Gram-positive bacteria.
    • Yeast and fungi were also found to be sensitive to the 3 beta-amino and 3 beta-N-alkylamino derivatives, with activity correlating to substituent hydrophobicity.

    Conclusions:

    • Introduction of 3 beta-amino and 3 beta-N-alkylamino groups to deoxycholic acid derivatives substantially boosts antimicrobial efficacy.
    • The hydrophobicity of substituents at C-3 and C-24 is a critical factor in determining the potency of these novel antimicrobial agents.
    • These findings highlight the potential of modified deoxycholic acid as a basis for developing new antimicrobial drugs.