Flavonol Triglycosides from the Leaves of Silphium Albiflorum

In the course of chemotaxonomic studies of the genus Silphium two new and six known flavonol glycosides were isolated from the leaves of S. albiflorum. The structures of the new flavonoids were established by spectral analysis (1H NMR, 13C NMR, HMQC, HMBC, ROESY, TOCSY, MS) as isorhamnetin 3-O-α-L-r...

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Published inNatural product communications Vol. 1; no. 11
Main Authors Wojcińska, Małgorzata, Williams, Jeffrey, Mabry, Tom J., Ahmed, Ahmed A., Davis, Barry D., Tóth, Gabor, El-Sayed, Nabil H., Matławska, Irena, Clevinger, Jennifer
Format Journal Article
LanguageEnglish
Published Los Angeles, CA SAGE Publications 01.11.2006
Subjects
isorhamnetin and quercetin 3,7-O-triosides
flavonol O-glycosides
Silphium albiflorum
Asteraceae
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Summary:In the course of chemotaxonomic studies of the genus Silphium two new and six known flavonol glycosides were isolated from the leaves of S. albiflorum. The structures of the new flavonoids were established by spectral analysis (1H NMR, 13C NMR, HMQC, HMBC, ROESY, TOCSY, MS) as isorhamnetin 3-O-α-L-rhamnosyl (1′“→6″)-O-β-D-galactopyranoside 7-O-β-D-apiofuranoside (1) and quercetin 3-O-α-L-rhamnosyl (1′“→6″)-O-β-D-galactopyranoside 7-O-β-D-apiofuranoside (2). LC-MS and LC-MSn (with post-column manganese complexation) were applied to elucidate the structures of some of the studied compounds.
ISSN:1934-578X
1555-9475
DOI:10.1177/1934578X0600101105