Antiallergic activity of tetracyclic derivatives of quinoline-2-carboxylic acid. 2. Some benzothienoquinolinecarboxylic acids

Abstract
Some benzothienoquinolinecarboxylic acids were synthesized and tested in the rat passive cutaneous anaphylaxis (PCA) assay as potential antiallergic agents. Many of the compounds showed activity comparable to that shown by disodium cromoglycate (DSCG); 2 of them, 1,4-dihydro-4,6,6-trioxo-5-chloro[1]benzothieno[2,3-g]quinoline-2-carboxylic acid and 1,4-dihydro-1,7-dioxo[1]benzothieno[3,2-f]quinoline-3-carboxylic acid, showed potency approximately 8-fold greater than that of DSCG in the PCA assay.