New isoflavonoids from Erythrina arborescens and structure revision of anagyroidisoflavone A

摘要

Five hitherto unknown isoflavonoids, namely erythrinins D-H (>1–5), were isolated from the ethanol extract of Erythrina arborescens. Their structures were elucidated on the basis of extensive spectroscopic studies. In addition, the structure of anagyroidisoflavone A (>6a) has been revised as 1″-O-methylerythrinin F (>6) by re-analysis of the original spectroscopic data. Electronic Supplementary MaterialSupplementary material is available for this article at 10.1007/s13659-013-0062-3 and is accessible for authorized users.