Novel acetylated flavonoid glycosides from the leaves of Allium ursinum

Seven flavonoid glycosides, kaempferol 3-O-alpha-L-rhamnopyranosyl (1 -> 2)-[3-O-acetyl]-beta-D-glucopyranoside (1), kaempferol 3-O-alpha-L-rhamnopyronosyl (1 -> 2)-[6-O-acetyl]-beta-D-glucopyranoside (2), kaempferol 3-O-alpha-L-rhamnopyranosyl-(1 -> 2)-beta-D-glucopyranoside (3), kaempferol 3-O-beta-D-glucopyranoside (4), kaempferol 3,7-di-O-beta-D-glucopyranoside (5), 7-O-beta-D-glucopyranosyl kaempferol 3-O-alpha-L-rhamnopyranosyl-(1 -> 2)-beta-D-glucopyranoside (6), kaempferol 3-O-alpha-L-rhamnopyranosyl (1 -> 2)-beta-D-glucopyranoside-7-O-[2-O-(trans-p-coumatoyl)]-beta-D-glucopyranoside (7) were isolated from the n-butanol fraction of Allium ursinum L. and the structures of these compounds were elucidated on the basis of mass spectrometry, H-1 NMR, C-13 NMR, HMQC and HMBC data. Among them, 1 and 2 are novel compounds and compounds 4 and 5 were isolated from this plant species for the first time. (C) 2008 Elsevier Ltd. All rights reserved.