Antiulcer tricyclic imidazo [1,2-a]pyridines

Claim 1

A compound represented by the formula ##STR11## or a pharmaceutically acceptable salt thereof; wherein R 2 represents hydroxy, lower alkyl or hydroxyloweralkyl; R 3 represents hydrogen, lower alkyl, --CH 2 CN, hydroxyloweralkyl, --NO, --CH 2 NC or ##STR12## wherein R 4 and R 5 are independently selected from the group consisting of hydrogen and lower alkyl; X represents hydrogen, lower alkyl, halogen, hydroxy, lower alkoxy or trifluoromethyl; A is a non-aromatic ring fused to the pyridine ring containing, with the carbon atoms of the pyridine ring to which it is attached, 5 or 6 ring atoms of which all are carbon or one is selected from nitrogen, sulfur or oxygen with the remaining atoms being carbon wherein the heteroatom of the 5-membered ring is at the 7 or 9 position and the heteroatom of the 6-membered ring is at the 10 position; Ar represents phenyl, pyridyl, thienyl, imidazolyl, furanyl or X'- Y'- and Z'- substituted- phenyl wherein each of X'-, Y'- and Z'- independently is as defined for X; and n is zero, one or two.