Synthesis, characterization and biological activities of some novel isatin derivatives

A series of novel (arylimino-2-oxo-2,3-dihydro-indol-1-yl)-acetic acid N'-(4-aryl-2-yl)-hydrazide derivatives (5a-g) were synthesized. The structures of the newly synthesized compounds were characterized by elemental analysis, FT-IR, H-, C-NMR and mass spectroscopy. The compounds were screened in vitro for antibacterial and antifungal activities against some human pathogenic microorganisms by the disc diffusion technique. Some of the compounds showed moderate to good biological activities when compared with commercially available drugs.