Importance

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Abstract

Compounds of the formula ##STR1## wherein R.sub.1 and R.sub.2, which may be identical to or different from each other, are each hydrogen, fluorine, chlorine, bromine, trifluoromethyl, hydroxyl, nitro, amino, cyano, methylsulfonamido, alkyl of 1 to 4 carbon atoms, alkoxy of 1 to 3 carbon atoms, (alkyl of 1 to 3 carbon atoms)thio or (alkanoyl of 2 to 4 carbon atoms)amino; R.sub.3 is hydrogen, fluorine, chlorine, bromine or alkyl of 1 to 3 carbon atoms; R.sub.4 is hydrogen, alkyl of 1 to 4 carbon atoms, hydroxy(alkyl of 2 to 4 carbon atoms), (alkoxy of 1 to 2 carbon atoms)-(alkyl of 2 to 4 carbon atoms), alkenyl of 3 to 6 carbon atoms, alkynyl of 3 to 6 carbon atoms, cycloalkyl of 3 to 7 carbon atoms, (cycloalkyl of 3 to 7 carbon atoms)-(alkyl of 1 to 3 carbon atoms) or (unsubstituted or substituted phenyl)-(alkyl of 1 to 3 carbon atoms) where the substituent is fluorine, chlorine, bromine, methyl, methoxy, hydroxyl or trifluoromethyl; and n is 1 or 2; and non-toxic, pharmacologically acceptable acid addition salts thereof. The compounds as well as their salts are useful as antiallergic.

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First Claim