Synthesis and antiulcer activity of the metabolites of 2-(4-ethyl-1-piperazinyl)-4-phenylquinoline dimaleate (AS-2646), a novel gastric antisecretory and antiulcer agent

The metabolites 3 and 4 of 2-(4-ethyl-1-piperazinyl)-4-phenylquinoline dimaleate (AS-2646, 1), a candidate as a gastric antisecretory and antiulcer drug, were synthesized to confirm the proposed structures. The effects of the metabolites 2-4 on ulcer induced by stress were determined.