Pterocarpans and a Novel Flavanone from Harpalyce brasiliana Roots

The novel (-)-7,8,3',4'-trihydroxy-8-(3 '',7 ''-dimethyl-octa-2 '',6 ''-dienoyl)-flavanone was isolated from the EtOH extract from the roots of Harpalyce brasiliana (Leguminosae) together with the known pterocarpans(-)-2-geranyl-3-hydroxy-8,9-methylenedioxypterocarpan, harpalicin, medicarpin, maackiain and cabenegrins A-I and A-II. The isolated metabolites were characterized on the basis of spectroscopic data, mainly 1D and 2D NMR.