Abstract:In order to understand the chemical constituents of Lepidium apetalum Willd., eight flavonoid glycosides were obtained from 50% EtOH extract of its seeds. On the basis of physicochemical and spectral data, they were identified as quercetin-3-O-β-d-glucoside (1), quercetin-3-O-β-d-glucuronide (2), quercetin-3,7-di-O-β-d-glucopyranoside (3), quercetin-3-O-β-d-glucosyl(1→2)-β-d-glucoside (4), quercetin-3-O-[2-O-(6-O-E-sinapoyl)-β-d-glucopyranosyl]-β-d-glucopyranoside (5), quercetin-3-O-[(6-O-trans-caffeoyl)-β-dglucopyranosyl(1→2)-β-d-glucopyranosyl]-7-O-β-d-glucopyranoside (6), isorhamnetin-3-O-sophoroside (7) and isorhamnetin-3-O-[2-O-(6-O-E-sinapoyl)-β-d-glucopyranosyl]-β-d-glucopyranoside (8). Among them, compound 3 was isolated from this species for the first time, and compounds 2, 4, 6 and 7 were obtained from Lepidium genus for the first time. Meanwhile, the NMR data of compound 6 was reported firstly.
