Antiallergy activity of substituted 11-oxo-11H-pyrido[2,1-b]quinazoline-8-carboxylic acids

Abstract
A series of substituted 11-oxo-11H-pyrido[2,1-b]quinazoline-8-carboxylic acids were prepared and evaluated as antiallergy agents. Several analogs were orally active. 2-Methyl-11-oxo-11H-pyrido[2,1-b]quinoazoline-8-carboxylic acid was superior to cromolyn sodium and doxantrazole orally and i.v. in the rat PCA [passive cutaneous anaplylaxis] test and a rat allergic bronchospasm model.