Synthesis and blood glucose lowering activity of some novel benzenesulfonylurea derivatives substituted with 6-aryl-4,5-dihyropyridazin-3(2H)-ones

Five (2a–e) benzenesulfonylurea derivatives bearing pyridazinone were synthesized by refluxing the appropriate 6-aryl-2-(p-sulfamylphenyl)-4,5-dihydropyridazine-3(2H)-one with benzylisocyanate in dry acetone over anhydrous K₂CO₃. These compounds were characterized by elemental analysis and various spectroscopic techniques viz; IR, ¹H NMR, ¹³C NMR, and MS data. These compounds (2a–e) at the dose of 20?mg/kg were tested for blood glucose lowering activity in glucose-fed hyperglycemic normal rats. Compound 2b showed more potent anti-hyperglycemic activity than the standard drug gliclazide. The compound 2b was also tested for its hypoglycemic effect in fasted normal rats. It also showed significant hypoglycemic effect (but less than that of gliclazide).