Antiallergic activity of tetracyclic derivatives of quinoline-2-carboxylic acids. 1

Abstract
Substitution of 1,4-dihydro-4-oxoquinoline-2-carboxylic acid by acetyl, benzoyl and phenylsulfonyl substituents enhanced activity in the rat passive cutaneous anaphylaxis assay. A further increase in activity to equipotency with DSCG [disodium cromoglycate] was achieved by incorporation of 8-benzoyl moiety into a tetracyclic structure to give 1,4-dihydro-4,11(1H,11H)-dioxoindeno[1,2-h]quinoline-2-carboxylic acid. In contrast, the reverse isomer had little activity.

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