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Structure activity relationships among the monobactams.

D P Bonner, R B Sykes

    The Journal of Antimicrobial Chemotherapy
    |October 1, 1984
    PubMed
    Summary
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    Molecular modifications of the monobactam nucleus (3-AMA) are crucial for antibacterial potential, with side chain structure influencing activity. The aminothiazoleoxime side chain significantly enhances antibacterial activity, particularly against Gram-negative bacteria.

    Area of Science:

    • Medicinal Chemistry
    • Antibacterial Drug Discovery
    • Organic Synthesis

    Background:

    • The monobactam nucleus (3-AMA) requires molecular substitution to achieve significant antibacterial activity, similar to penicillins and cephalosporins.
    • Structure-activity relationships of monobactam side chains parallel those of penicillins and cephalosporins due to shared enzymatic targets.

    Purpose of the Study:

    • To investigate the impact of various substitutions on the monobactam nucleus for antibacterial activity.
    • To identify key structural features that enhance antibacterial potency and spectrum.

    Main Methods:

    • Systematic modification of side chains and substitution at the 4-position of the monocyclic ring.
    • Evaluation of antibacterial activity against Gram-positive and Gram-negative bacteria.

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  • Assessment of beta-lactamase stability in relation to structural modifications.

    • Main Results:

    • The introduction of an aminothiazoleoxime side chain as the 3-acyl substituent dramatically increases antibacterial activity.
    • Polar groups at the alpha position of side chains result in poorly active compounds, a divergence from penicillin/cephalosporin SAR.
    • 4-position substitution's effect on activity is unpredictable, though essential for beta-lactamase stability in SO3-activated molecules.

    Conclusions:

    • The aminothiazoleoxime side chain is critical for potent antibacterial activity, especially against Gram-negative bacteria.
    • Strategic substitution at the 3-acyl and 4-positions of the monobactam nucleus can modulate antibacterial spectrum and stability.
    • Further exploration of activating groups on the monocyclic beta-lactam ring holds promise for novel antibacterial agents.