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Spiro-Lactams as Novel Antimicrobial Agents.

Américo J S Alves¹, Nuno G Alves¹, Cátia C Caratão¹

¹CQC and Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal.

Current Topics in Medicinal Chemistry

|November 9, 2019

Summary

Researchers explored novel spiro-lactam compounds for antimicrobial potential. Replacing the beta-lactam ring with a gamma-lactam did not yield similar activity, suggesting the beta-lactam core is crucial for anti-HIV and anti-malarial effects.

Keywords:

5-Oxohexahydropyrrolo[2,1-b]thiazoles Anti-HIV Agents Antiplasmodial Agents Diazo Compounds Dipolar Cycloaddition Spiro-penicillanate Spiro-γ-lactams.

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A Robust Pneumonia Model in Immunocompetent Rodents to Evaluate Antibacterial Efficacy against S. pneumoniae, H. influenzae, K. pneumoniae, P. aeruginosa or A. baumannii

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Published on: January 2, 2017

Area of Science:

Medicinal Chemistry
Drug Discovery
Organic Synthesis

Background:

Investigated structural modifications of known spiro-beta-lactams with antimicrobial properties.
Focused on developing novel spiro-lactam derivatives for enhanced biological activity.

Purpose of the Study:

To synthesize and evaluate novel spiro-lactams based on lead compounds.
To explore the impact of replacing the beta-lactam ring with a gamma-lactam ring on biological activity.

Main Methods:

Synthesized chiral spiro-gamma-lactams using 1,3-dipolar cycloaddition.
Evaluated in vitro activity against Human Immunodeficiency Virus (HIV) and Plasmodium.

Main Results:

Established a new synthetic route for chiral spiro-gamma-lactams.
Identified one derivative with anti-HIV activity and two with anti-malarial activity (IC50 < 3.5 µM).
Compounds were non-cytotoxic, indicating potential for further drug development.

Conclusions:

Structural modulation by replacing beta-lactam with gamma-lactam did not replicate biological activity.
Computational studies showed no significant pharmacophoric differences between beta- and gamma-lactams.
The beta-lactam core appears essential for activity against HIV and Plasmodium.