title: Synthesis and antiallergic properties of some 4H,5H-pyrano[3,2-c][1]benzopyran-4-one, 4H,5H-[1]benzothiopyrano[4,3-b]pyran-4-one, and 1,4-dihydro-5h-[1]benzothiopyrano[4,3-b]pyridin-4-one derivatives.
abstract: A series of novel 2-carboxylic acids of the title ring systems has been synthesized from the corresponding 3-acetyl-4H-[1]benzopyran-4-one and benzothiopyran-4-one. These acids were examined for their ability to inhibit the rat passive cutaneous anaphylaxis; the pyridinone carboxylic acids 6 displayed a higher degree of iv and ip anaphylactic activities than their pyranone analogues 5. The potassium salt 5a (R6 = K) was the only compound that exhibited a moderate oral activity.
mesh_terms: D000818:Animals; D001578:Benzopyrans / Q000138:chemical synthesis* / Q000494:pharmacology; D055598:Chemical Phenomena; D002621:Chemistry; D006967:Hypersensitivity / Q000188:drug therapy*; D008297:Male; D010323:Passive Cutaneous Anaphylaxis / Q000187:drug effects; D051381:Rats
chemical_list: D001578:Benzopyrans