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Rhamnetin Glycosides from the Genus Spiraea
- Olennikov, D.N., Chirikova, N.K.
- Chemistry of natural compounds 2018 v.54 no.1 pp. 41-45
- Spiraea, chemistry, chromatography, glycosides, isorhamnetin, kaempferol, leaves, mass spectrometry, nuclear magnetic resonance spectroscopy, quercetin
- Rhamnetin (7-O-methylquercetin, 1) and its glycosides were found for the first time in the genus Spiraea (Rosaceae) during chromatographic studies of representatives from the subgenus Protospiraea. Leaves of S. salicifolia yielded 1, rhamnetin-3-O-β-D-glucopyranoside (2), and two new flavonoids 3 and 4 that were identified by UV, IR, and NMR spectroscopy and mass spectrometry as rhamnetin-3-O-(6″-O-p-coumaroyl)-β-D-glucopyranoside (spiraearhamnin A, 3) and rhamnetin-3-O-(6″-O-caffeoyl)-β-D-glucopyranoside (spiraearhamnin B, 4). Leaves of S. betulifolia and S. betulifolia var. aemiliana afforded 1 and 2 and glycosides of kaempferol, quercetin, and isorhamnetin. Species of the subgenus Metaspiraea (S. alpina, S. chamaedryfolia, S. dahurica, S. hypericifolia, and S. media) did not contain 1 or its derivatives.