| abstract |
ABSTRACT A compound of formula (I) (I) wherein m is 0 or 1; n is 1 or 2; R1 is H, alkyl, alkenyl, formyl, alkanoyl; X is a single bond, alkylene, alkenylene, phenylene, cyclohexylene or cyclo-hexenylene; R2 is a group -CH2Z where Z is a halogen, a group wherein each R7 and R8 are H, alkyl or form together with the N atom a heterocyclic ring, or R2 is carboxy or (substituted) alkoxycarbonyl; R3 is H or alkyl; R4, R5 and R6 are H, halogen, alkyl, haloalkyl, OH, alkoxy, alkenyloxy, formyloxy, alkanoyloxy, carboxy or (aminosubstituted) alkoxycarbonyl; which has anti-allergic activity is prepared by several processes. |