Design and Synthesis of Novel Heterocyclic Compounds with Enhanced Antimicrobial Activity

https://doi.org/10.5281/zenodo.19229032

Abstract

The escalating crisis of antimicrobial resistance (AMR) poses a severe threat to global health, with projections estimating up to 10 million annual deaths by 2050 due to drug-resistant pathogens such as the ESCAPE group. This review explores the design and synthesis of novel heterocyclic compounds primarily nitrogen-containing scaffolds like benzimidazoles, triazoles, quinolines, and their hybrids as promising antimicrobial agents. These structures leverage pharmacophoric versatility, bioisosteric mimicry, and multi-targeting strategies to combat resistance mechanisms, including enzyme inactivation and efflux pumps. Key innovations include rational hybridization for broad-spectrum activity, computational tools (QSAR, pharmacophore modeling, molecular docking, and dynamics simulations) for predictive design, and sustainable synthetic methodologies (microwave-assisted organic synthesis, multicomponent reactions) emphasizing green chemistry principles. Benzimidazole derivatives exhibit tautomeric flexibility for enhanced enzyme binding, triazoles provide metabolic stability and linker functions via click chemistry, while quinoline hybrids target DNA gyrase and DHPS with MIC values as low as 1–5 μmol/mL. The integration of CADD accelerates lead optimization, with high statistical models (R² > 0.95) guiding anti-tubercular and antibacterial development. Overall, this work underscores the potential of heterocyclic chemistry to revitalize antimicrobial pipelines through efficient, eco-friendly synthesis and precise molecular engineering, offering a pathway to mitigate AMR.