New flavonoids and other constituents from Ouratea hexasperma (Ochnaceae)

chromatographical fractionation of the methanol extract from the branches of ouratea hexasperma (ochnaceae) afforded two new flavonoids, 7-o-β-d-glucopyranosyl-6-(3-methylbut-2-enyl)-5,4'-dihydroxyflavanonol (6-β,β-dimethylallylaromadendrin-7-o-β-d-glucoside) and 7-o-β-d-glucopyranosyl-6-(3-methylbut-2-enyl)-3,5,4'-trihydroxyflavone (6-β,β-dimethylallylkaempferol-7-o-β-d-glucoside) besides a mixture of sitosterol and stigmasterol,lupeol, sitosterol-3-o-β-d-glycopyranoside and 2,4-dihydroxyphenylacetic acid. the structures were established by analysis of ir, esi-ms, and nmr spectra of the natural substances, and those of the dimethyl ether and peracetyl-derivatives of the new flavone, as well as comparison with literature values.