Bicyclic compounds with potential antiulcer and/or antisecretory activity. I. 4,5,6,7-Tetrahydrobenzimidazoles

The remarkable antiulcer and antisecretory activity of some previously described 4,5,6,7-tetrahydroimidazo[4,5-c]pyridine derivatives prompted us to further investigate related bicyclic systems. Accordingly, a series of 5-amino- and 5-aminomethyl-4,5,6,7-tetrahydrobenzimidazoles, regiospecifically alkylated in position 1, were synthesized and tested. Only a few 1-ethyl-5-amino derivatives displayed a reasonable antiulcer activity in comparison with our former class of compounds.