Flavonoids from Tephrosia aequilata

Abstract

From the roots of the plant Tephrosia aequilata Baker, five flavonoids were isolated of which, 3,4:8,9-dimethylenedioxypterocarpan is reported for the first time. Its structure and those of the already known flavonoids were established by physical and spectroscopic analysis. Application of 2D NMR techniques was useful for complete characterization of the new pterocarpan as well as the other known flavonoids. A pterocarpan, 3,4:8,9-dimethylenedioxypterocarpan (1) was isolated from the roots of Tephrosia aequilata together with four known flavonoids. Their structures were established by physical and spectroscopic analyses. .