Sulfonamide tethered 1,4-disubstituted 1,2,3-triazoles: Synthesis and antibacterial evaluation

A series of twenty one sulfonamide tethered 1,4-disubstituted 1,2,3-triazoles was synthesized in good yields through a facile expeditious click synthetic protocol involving Cu(I) mediated cyclization between terminal alkynes containing ester linkage and 4-azidobenzenesulfonamide. All the synthesized triazoles were characterized using FTIR,1H NMR,13C NMR and HRMS techniques. Synthesized compounds were also evaluated for in vitro antibacterial activity against two Gram positive bacteria (Staphylococcus aureus, Bacillus subtilis) and two Gram negative bacteria (Klebsiella pneumoniae, Escherichia coli) by serial dilution method. In the series, compound 6 l, 3-(1-(4-sulfamoylphenyl)-1H-1,2,3-triazol-4-yl)propyl 4-bromobenzoate with Minimum Inhibitory Concentration (MIC) 0.0134 µmol/mL exhibited appreciable antibacterial activity against all bacterial strains comparable with standard drug Ciprofloxacin (MIC 0.0189 µmol/mL). Further, molecular docking study was also performed to gain insight for binding interactions with dihydropteroate synthase enzyme.