ERYTHRINA STUDIES .34. PHENOLIC METABOLITES FROM ERYTHRINA SPECIES

From the stem and root bark of Erythrina sigmoidea and E. eriotricha, one new prenylated flavanone, named sigmoidin L, and two new esters of ferulic and isoferulic acid, erythrinassinates C and D, were isolated together with eight known compounds, including one ester of isoferuli c acid [3 beta-O-(E)-isoferuloyl oleanolic acid], one flavanone (sigmo idin A), four isoflavones (scandenone, 6,8-diprenylgenistein), flemiph ilippinin B and 8-prenyldaidzein and two pterocarpans (gangetinin and calopocarpin). Their structures were elucidated by analysis of spectra l data and chemical evidence. The in vitro anitmicrobial spectrum and potencies of the isolated compounds are also reported. (C) 1997 Elsevi er Science Ltd.