Erythrina studies. Part 2. Structures of three novel prenylated antibacterial flavanones, sigmoidins A–C, from Erythrina sigmoidea Hua

Abstract

Three new prenylflavanones, (1), (6), and (10), have been isolated from the chloroform extract of Erythrina sigmoidea Hua (Fabaceae) bark and characterised. Two of the three compounds exhibit noteworthy antibiotic activity against Gram-positive bacteria. Their structures were elucidated from spectral data and chemical correlations.