Schiff bases and hydrazones of substituted isatins (1–28) were prepared by reacting isatin and aromatic primary amines/hydrazines. A new series of the corresponding N-Mannich base (29–35) was synthesised by reacting them with formaldehyde and diphenyl amine. The chemical structures were confirmed by means of 1H-NMR, IR spectral data and elemental analysis. The compounds were screened for antibacterial activity against seven Gram (+) ...
