PROCESS FOR PREPARING NOVEL PYRIMIDO-/2,1-B/-BENZOTHIAZOLES AND THEIR SALTS

The present invention relates to compounds of formula I [wherein R and R3,which may be the same or different, each represents a hydrogen atom or a straight-chained or branched C1-6 alkyl group or together with the intervening carbon atom represent a C3-6 cycloalkyl group; R1 represents a C7-12 straight-chained, branched or cyclic alkoxy group; and R2 represents a hydrogen atom, a straight-chained or branched C1-6 alkyl group, a C2-7 alkoxycarbonyl group, a C3-6 cycloalkyl group, an aralkyl group, an aryl group (unsubstituted or substituted by one or more halogen atoms or C1-6 alkyl, C1-6 alkoxy or nitro groups) or a heteroaryl group] and acid addition salts thereof, to processes for their preparation and to their application as drugs. Compounds 1 have anti-allergy activity.