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Structure elucidation of three new acetylated flavonoid glycosides from Centaurium spicatum
Author(s) -
Shahat Abdelaaty A.,
Apers Sandra,
Miert Sabine Van,
Claeys Magda,
Pieters Luc,
Vlietinck Arnold
Publication year - 2001
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.900
Subject(s) - chemistry , dept , quercetin , glycoside , stereochemistry , heteronuclear single quantum coherence spectroscopy , acetylation , two dimensional nuclear magnetic resonance spectroscopy , carbon 13 nmr , flavonoid , glucoside , organic chemistry , biochemistry , antioxidant , gene , medicine , alternative medicine , pathology
Three new acetylated flavonol glycosides, quercetin 3‐ O ‐(2,3,4‐triacetyl‐α‐rhamnopyranosyl)‐(1 → 6)‐β‐galactopyranoside, quercetin 3‐ O ‐[(2,3,4‐triacetyl‐α‐rhamnopyranosyl)‐(1 → 6)]‐3‐acetyl‐β‐galactopyranoside and quercetin 3‐ O ‐[(2,3,4‐triacetyl‐α‐rhamnopyranosyl)‐(1 → 6)]‐4‐acetyl‐β‐galactopyranoside, were isolated from Centaurium spicatum (L.) Fritsch (Gentianaceae). Structure elucidation, especially the localization of the acetyl groups, and complete 1 H and 13 C NMR assignments of these biologically active compounds were carried out using one‐ and two‐dimensional NMR methods, including 1 H and 13 C NMR, DEPT‐135 and DEPT‐90 and gradient‐assisted experiments such as DQF‐COSY, TOCSY, HSQC and HMBC experiments. Copyright © 2001 John Wiley & Sons, Ltd.