An unusual C6-C6" linked flavonoid from Miconia cabucu (Melastomataceae)

被引：20
|
作者：
Rodrigues, Juliana [1 ]
Rinaldo, Daniel [1 ]
dos Santos, Lourdes Campaner [1 ]
Vilegas, Wagner [1 ]
机构：
[1] Univ Estadual Paulista, Inst Quim, UNESP, BR-1480197 Sao Paulo, Brazil
来源：
PHYTOCHEMISTRY | 2007年 / 68卷 / 13期
基金：
巴西圣保罗研究基金会;
关键词：
Miconia cabucu; Melastomataceae; flavonoids; flavone dimer; TRITERPENES;
D O I：
10.1016/j.phytochem.2007.04.020
中图分类号：
Q5 [生物化学]; Q7 [分子生物学];
学科分类号：
071010 ; 081704 ;
摘要：
Chromatographic fractionation of the methanolic extract from the leaves of Miconia cabucu Hoehne (Melastomataceae) afforded the first example of a C-6-C-6" linked flavone dimer, 5-hydroxy-4',7-dimethoxyflavone-(6-C-6")-5"-hydroxy-3 4"',7"-trimethoxyflavone as well as the known compounds, quercetin- 3-O-alpha-L- rhamnopyranosyl-(2 -> 1)-O-beta-D-xylopyranoside, quercetin-3-O-alpha-L-rhamnopyranoside, myricetin-3-O-alpha-L-rhamnopyranoside, quercetin-3-O-beta-D-glucopyranoside, kaempferol -3-O-beta-D-(6"-coumaroyl) -glucopyranoside and gallic acid. Their chemical identities were established by application of NMR spectroscopic methods including 2D-NMR, as well as UV and ESI-MS analyses. (c) 2007 Elsevier Ltd. All rights reserved.
引用
收藏
页码：1781 / 1784
页数：4
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