Two new acylated flavonoid glycosides from Morina nepalensis var. alba Hand.-Mazz.
✍ Scribed by Rongwei Teng; Hongyang Xie; Hai Zhou Li; Xikui Liu; Dezu Wang; Chongren Yang
- Publisher
- John Wiley and Sons
- Year
- 2002
- Tongue
- English
- Weight
- 118 KB
- Volume
- 40
- Category
- Article
- ISSN
- 0749-1581
- DOI
- 10.1002/mrc.1034
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✦ Synopsis
Abstract
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.