Synthesis and Antiallergic Activity of N-[4-(4-Diphenylmethyl-1-piperazinyl)butyl]-1, 4-dihydro-4-oxopyridine-3-carboxamides

Abstract

A new series of oxopyridinecarboxamide derivatives 3a-g and 5a were synthesized and evaluated for their antiallergic activity. 1, 4-Dihydro-7-methyl-4-oxo-1, 8-naphthyridine-3-carboxamides 3a and 5a exhibited potent antiallergic activity (inhibitory rates of 80.7 and 88.3%, respectively, at 20mg/kg, p.o.) in the rat passive cutaneous anaphylaxis (PCA) test and also exhibited much more potent in vitro inhibitory activity than caffeic acid against the enzyme 5-lipoxygenase (5-LO). Their in vitro antihistamine activity, however, was weaker than that of ketotifen. Compounds 3a and 5a are viewed as promising candidates for antiallergic agents.