The invention concerns benzoquinolizines of general formula ##STR1## and their pharmaceutically acceptable acid addition salts. In formula (I), R represents hydrogen or lower alkyl, R.sup.1 and R.sup.2 which may be the same or different each represent hydrogen, lower alkyl, lower alkoxy or halogen, R.sup.3 and R.sup.4 which may be the same or different each represents lower alkyl, halo(lower)alkyl or aryl and A represents a lower alkylene group having 1 to 3 carbon atoms in the chain between the two N atoms. The compounds possess .alpha..sub.2 -adrenoceptor antagonistic activity in warm blooded animals.
本发明涉及通式为##STR1##及其药学上可接受的酸加盐的苯并
喹啉。在公式(I)中,R代表氢或较低的烷基,R.sup.1和R.sup.2可以相同也可以不同,分别代表氢、较低的烷基、较低的烷氧基或卤素,R.sup.3和R.sup.4可以相同也可以不同,分别代表较低的烷基、卤素(较低)烷基或芳基,A代表两个N原子之间链上有1到3个碳原子的较低烷基。这些化合物在温血动物中具有α2-
肾上腺素能受体拮抗活性。