METHOD OF PREPARING 1,2-DIHYDROQUINOLIN-2-ONES OR THEIR SALTS (ITS VERSIONS)

摘要

A (4-substituted-piperazin-1-yl)-alkoxy-2-oxo-1,2-dihydroquinoline of the formula: IMAGE in which R1, R2 and R3 each independently is hydrogen or a lower alkyl radical, R4 is hydrogen, halogen, or a lower alkyl or lower alkoxy radical, n is 2, 3, 4 or 5 and A is a valency bond or a methylene radical optionally substituted by a phenyl radical, or a salt thereof, which exhibits anti-allergic and anti-hypertensive activity.