Abstract
From the epigeal part ofIris lactea two acylated C-glycosylflavones not described in the literature have been isolated. On the basis of chemical transformations, and the results of UV, IR, and NMR spectroscopy, the following structures have been established for them: substance (I) — 5-hydroxy-4',7-dimethoxyflavone 6-C-[0-(2-acetyl-α-L-rhamnopyranosyl)-(1→2)-x-acetyl-β-D-glycopyranoside] (diacetylembinin); substance (II) — 5-hydroxy-4',7-dimethoxyflavone 6-C-[0(2-acetyl-α-L-rhamnopyranosyl)-(1→2)-D-glycopyranoside] (acetylembinin). The existence of rotamers for 6-C-glucoflavones has been established for the first time.
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Additional information
Leningrad Institute of Pharmaceutical Chemistry, All-Union Scientific-Research Institute of Medicinal Plants, Moscow. Translated from Khimiya Prirodnykh Soedinenii, No. 5, pp. 589–595, September–October, 1984.
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Pryakhina, N.I., Sheichenko, V.I. & Blinova, K.F. Acylated C-glycosides ofIris lactea . Chem Nat Compd 20, 554–559 (1984). https://doi.org/10.1007/BF00580064
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DOI: https://doi.org/10.1007/BF00580064