Antagonists of slow reacting substance of anaphylaxis. Synthesis of a series of chromone-2-carboxylic acids

Abstract
A series of substituted chromone-2-carboxylic acids was synthesized and tested as antagonists of SRS-A [slow reacting substance of anaphylaxis] induced contractions of isolated guinea pig ileum. This work led to the discovery of sodium 7-[3-(4-acetyl-3-hydroxy-2-propylphenoxy)-2-hydroxypropoxyl-4-oxo-8-propyl-4H-1-benzopyran-2-carboxylate (FPL 55712) which is the 1st reported specific antagonist of SRS-A. Some structural requirements for biological activity within this series are discussed.