SYNTHESIS AND BIOLOGICAL-ACTIVITY OF SOME NEW PYRIDAZINE DERIVATIVES

Condensation of beta-aroyl-alpha-{[}1,3-diphenyl-5(4H)-oxo-pyrazol-4-yl] propionic acid with hydrazine hydrate affords 4,5-dihydro-3(2H)-pyridazinone (2). Reaction of 2 with POCl3 and P2S5 gives a dichloro derivative (7) and a dithione (4). The behavior of the dichloro and dithione derivatives toward various reagents was studied. The in vitro antibacterial screening reveals moderate activities against certain bacteria.