Synthesis,molecular docking,ADME study,and antimicrobial potency of piperazine based cinnamic acid bearing coumarin moieties as a DNA gyrase inhibitor

A series of novel piperazine based cinnamic acid bearing coumarin derivatives were designed and synthesized by piperazine based cinnamic acids esterification with 4-hydroxycoumarin and characterized by various spectral techniques like infrared, ¹H nuclear magnetic resonance (NMR), ¹³C NMR, and mass. The novel bioactive compounds (7a-7m) screen their potential against different bacterial and fungal strains. Compound 7g (minimum inhibitory concentration MIC] = 12.5 µg/ml) exhibited potent antibacterial activity against Escherichia coli strain. Compounds 7d, 7f, 7g, 7k, 7l , and 7m showed potent antibacterial activity against all bacterial strains. Compounds 7a, 7g, 7h, 7k, 7l , and 7m exhibited potent antifungal activity against all fungal strains. Furthermore, a molecular docking study revealed that compounds 7d, 7f, 7g , and 7k could bind to the active site of E. coli DNA gyrase subunit B protein and form hydrogen bonding with crucial amino acid residues Arg136 in the active sites. Comprehensively, our study recommends that 7d, 7f, 7g , and 7k could be a promising lead for developing more efficient antimicrobial drug candidates and DNA gyrase inhibitors.