Flavanones from the stem bark of Erythrina sigmoidea

Abstract

Chemical analysis of the stem bark of Erythrina sigmoidea Hua yielded two new flavonoids, designated sigmoidin M (1) and sigmoidin N (2). Their structures were established by chemical and spectroscopic means as 5,7-dihydroxy-3′- O-prenyl-(3″,4″-dihydroxy-2″,2″-dimethylpyrano) [5″,6″:4′,5′]flavanone (1) and 5,7,3′-trihydroxy- (3″-hydroxy-2″-(1-hydroxyisopropyl)-[4′,5:4″,5″] furanoflavanone (2), respectively. Sigmoidin M exhibited antimicrobial activity.