Structure Identification: |
Chin J Nat Med. 2015 Aug;13(8):628-33. | Identification and characterization of three new flavonoids from Rhododendron dauricum.[Pubmed: 26253496] | The present study was designed to determine the major chemical constituents of the leaves of Rhododendron dauricum L.
METHODS AND RESULTS:
Compounds were isolated and purified by various chromatographic methods, and their structures were elucidated by physicochemical properties and spectral data. The present study identified two new C-methyl flavanones, 5, 7, 3', 5'-tetrahydroxy-6, 8-di-C-methyl flavanone (1) and 5, 4'-dihydroxy-8-C-methylflavanone-7-O-β-D-glucopyranoside (2), and one new flavonoid glycoside, quercetin-3-O-β-D-(6″-O-cinnamoyl)-galactoside (3), along with seven known compounds, including Syzalterin (4), poriolin (5), farrerol-7-O-β-D-glucopyranoside (6), myrciacetin (7), quercetin-3-O-β-D-(6-p-hydroxy-benzoyl)-galactoside (8), quercetin-3-O-β-D-(6-p-coumaroyl)-galactoside (9), and 5, 7, 3', 5'-tetrahydroxyl flavanone (10).
CONCLUSIONS:
Compounds 1-3 were determined to be new flavonoids; compounds 4-6 were isolated from this species for the first time; and compounds 7-10 were reported for the first time from this genus. |
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