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Two new acylated flavonoid glycosides from Morina nepalensis var. alba Hand.‐Mazz.
Author(s) -
Teng Rongwei,
Xie Hongyang,
Li Hai Zhou,
Liu Xikui,
Wang Dezu,
Yang Chongren
Publication year - 2002
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.1034
Subject(s) - chemistry , quercetin , glycoside , flavonoid , stereochemistry , apigenin , two dimensional nuclear magnetic resonance spectroscopy , organic chemistry , antioxidant
From the whole plant of Morina nepalensis var. alba Hand.‐Mazz., two new acylated flavonoid glycosides ( 1 and 2 ), together with four known flavonoid glycosides ( 3–6 ), were isolated. Their structures were determined to be quercetin 3‐ O ‐[2″′‐ O ‐( E )‐caffeoyl]‐α‐ L ‐arabinopyranosyl‐(1→6)‐β‐ D ‐galactopyranoside (monepalin A, 1 ), quercetin 3‐ O ‐[2″′‐ O ‐( E )‐caffeoyl]‐α‐ L ‐arabinopyranosyl‐(1→6)‐β‐ D ‐glucopyranoside (monepalin B, 2 ), quercetin 3‐ O ‐α‐ L ‐arabinopyranosyl‐(1→6)‐β‐ D ‐galactopyranoside (rumarin, 3 ), quercetin 3‐ O ‐β‐ D ‐galactopyranoside ( 4 ), quercetin 3‐ O ‐β‐ D ‐glucopyranoside ( 5 ) and apigenin 4 ′ ‐ O ‐β‐ D ‐glucopyranoside ( 6 ). Their structures were determined on the basis of chemical and spectroscopic evidence. Complete assignments of the 1 H and 13 C NMR spectra of all compounds were achieved from the 2D NMR spectra, including H–H COSY, HMQC, HMBC and 2D HMQC‐TOCSY spectra. Copyright © 2002 John Wiley & Sons, Ltd.