Innovative Antimicrobial Agents: A Comprehensive Review of Fluoroquinolone-Thiadiazole Hybrid Design, Synthesis, and Activity

ABSTRACT The rise in antimicrobial resistance (AMR) presents a critical challenge to public health, prompting an urgent need for innovative therapies to combat multidrug-resistant infections. Among various drug development strategies, the hybridization of fluoroquinolones with thiadiazole rings has emerged as a promising approach. Fluoroquinolones are known for their broad-spectrum antimicrobial activity, primarily targeting bacterial DNA gyrase and topoisomerase IV, which are crucial for bacterial DNA replication. However, the widespread and prolonged use of fluoroquinolones has led to a decline in their efficacy due to growing bacterial resistance. To counter this, recent research has explored the synthesis of fluoroquinolone-thiadiazole hybrids to achieve enhanced antimicrobial potency and potentially reduce the likelihood of resistance development. This review provides a comprehensive examination of fluoroquinolone-thiadiazole hybrids, focusing on their design, synthesis, and antimicrobial evaluation. By introducing thiadiazole moieties, known for their diverse pharmacological properties and intrinsic antimicrobial potential, these hybrid compounds can demonstrate improved efficacy against resistant bacterial strains. The design strategy discussed involves molecular docking and SAR (structure-activity relationship) analysis to optimize binding affinity to bacterial targets, especially DNA gyrase and topoisomerase IV. The SAR insights provided in this review offer guidance for future structural modifications to improve efficacy further. In conclusion, fluoroquinolone-thiadiazole hybrids represent a promising new class of antimicrobial agents, with enhanced activity against resistant bacteria. This innovative approach not only contributes to overcoming the limitations posed by traditional fluoroquinolones but also opens a pathway for the development of next-generation antibiotics capable of addressing the growing AMR crisis. Continued research into fluoroquinolone-thiadiazole hybrids may significantly impact the future landscape of antimicrobial therapy. Keywords: Fluoroquinolone-thiadiazole hybrid, antimicrobial resistance, multidrug-resistant bacteria, bacterial DNA gyrase inhibition, hybrid drug design, structure-activity relationship (SAR), innovative antimicrobial agents, broad-spectrum antibiotics.