Title: 4-Oxo-4H-pyrano[3,2-c]quinoline-2-carboxylic acids and salts thereof

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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, alkyl of 1 to 4 carbon atoms, phenyl, hydroxyl, alkoxy of 1 to 3 carbon atoms, alkylmercapto of 1 to 3 carbon atoms, hydroxycarbonyl or ##STR2## where R.sub.3 and R.sub.4 are each alkyl of 1 to 4 carbon atoms or, together with each other and the nitrogen atom to which they are attached, morpholino, piperidino, methylpiperidino or phenyl-piperidino; or R.sub.1 and R.sub.2, together with each other and adjacent carbon atoms of the benzene ring to which they are attached, --CH=CH--CH=CH--, --CH.sub.2 --CH.sub.2 --CH.sub.2 --CH.sub.2 -- or --O--CH.sub.2 --O--; and salts thereof. The compounds are useful as antiallergics.


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