Two new flavonol glycosides from Dimocarpus longan leaves |
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Authors: | Yongmei Xue Wenjing Wang Yujiao Liu Rui Zhan |
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Institution: | 1. School of Chemistry and Chemical Engineering, Yunnan Normal University, Kunming 650500, P.R. China;2. Department of Traditional Chinese Medicine, Yunnan University of Traditional Chinese Medicine, Kunming 650500, P.R. China;3. Department of Traditional Chinese Medicine, Yunnan University of Traditional Chinese Medicine, Kunming 650500, P.R. China |
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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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Keywords: | Dimocarpus longan Sapindaceae flavonol glycoside |
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