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Two new flavonol glycosides from Dimocarpus longan leaves.

Authors
Type
Published Article
Journal
Natural product research
Publication Date
Volume
29
Issue
2
Pages
163–168
Identifiers
DOI: 10.1080/14786419.2014.971318
PMID: 25325562
Source
Medline
Keywords
  • Dimocarpus Longan
  • Sapindaceae
  • Flavonol Glycoside

Abstract

From the extracts of Dimocarpus longan Lour leaves, 2 unusual flavonol glycosides, quercetin 3-O-(3″-O-2‴-methyl-2‴-hydroxylethyl)-β-D-xyloside (1) and quercetin 3-O-(3″-O-2‴-methyl-2‴-hydroxylethyl)-α-L-rhamnopyranoside (2), as well as 10 known compounds including 2 flavonol glycosides, afzelin (3) and kaempferol-3-O-α-L-rhamnopyranoside (4), 2 flavans, (-)-epicatechin (5) and proanthocyanidin A-2 (6), 3 triterpenoids, friedelin (7), epifriedelanol (8) and β-amyrin (9), a peptide, N-benzoylphenylalanyl-N-benzoylphenylalaninate (10), and 2 sterols, β-sitosterol (11) and daucosterol (12) were isolated and identified by using combination of mass spectrometry and various 1D and 2D NMR techniques. This is the first report of flavonoid glycosides possessing a 2-methyl-2-hydroxylethoxyl group in sugar moiety from D. longan.

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