Pterocarpin and isoflavan derivatives from Canavalia maritima (Aubl.) Thou.

P terocarpin and isoflavan derivatives were isolated from ethanol extract of Canavalia maritima (Aubl.) Thou on column chromatography. By analyzing spectral data, the structures were elucidated as 2-hydroxy-3, 9-dimethoxypterocarpin (1), 4-hydroxy-3-methoxy-8,9-methylenedioxypterocarpan (2), medicarpin (3), 7-hydroxy-2',4'-dimethoxy isoflavan (4), 7-hydroxy-4'-methoxyisofalvone (5) 5,7,4'-trihydroxyisoflavone (6), 3,7-dihydroxy-6-methoxylflavone (7) and quercetin (8). This paper firstly reports the compounds of pterocarpan and isoflavan from C . maritima, which would help understand the pharmaceutical mechanisms of these bioactive substances for wide medical applications. T he 1 3C-NMR spectr al data of Compound 1 was reported for the first time.