ABSTRACT
1,3-propane- and/or 1,4-butane sultone (sultones are internal esters of hydroxyl sulfonic acid) are used as a chemical intermediate to introduce sulfopropyl and/or sulfobutyl groups into heterocyclic molecules and to confer water solubility and anionic character to the molecules. Therefore, the synthesis of three novel functionalized N-sulfonates is described. These sulfonates contain pyridyl (2a–f), quinolyl (4a–m), and isoquinolyl (6a,b) functional groups with potential biological activity. The synthesized quaternary ammonium salts, 3-(2 or 4-arylpyridinium-1-yl)propane or butane-1-sulfonate (2a–f), 3-(alkylquinolinium-1-yl)propane or butane-1-sulfonate (4a–m), and 3-(alkylisoquinolinium-1-yl)propane or butane-1-sulfonate (6a,b), were screened for their antimicrobial and antifungal activities. Among all tested compounds, it was found that compound 4-(4-carboxypyridinium-1-yl)butane-1-sulfonate (2f) showed high activity against Gram-positive bacteria, Gram-negative bacteria, and tested fungi. Most of the compounds showed a moderate degree of antimicrobial activity. The structures of these compounds were confirmed on the basis of their analytical and spectral data (infrared, 1H-NMR and 13C-NMR spectroscopy, and mass spectral data).
Acknowledgments
The authors wish to thank the management of microbiology laboratory, Faculty of Pharmacy, Mansoura University, for their support to carry out antimicrobial activity studies.