Synthesis and antiulcer activity of 2-[5-substituted-1-H-benzo(d) imidazol-2-yl sulfinyl]methyl-3-substituted quinazoline-4-(3H) ones

2-[5-substituted-1-H-benzo(d) imidazol-2-yl sulfinyl] methyl-3-substituted quinazoline-4-(3H)-one derivatives were synthesized and tested for antiulcer activity against pylorus ligation-induced, aspirin induced and ethanol induced ulcer in rat model. All the synthesized compounds were characterized by using IR, MS and (1)H NMR spectral and elemental analysis. The compounds were scramed for their antiulcer activity: compounds 5k and 5n showed higher activity than omeprazole used as standard.