Astrasieversianins IX,XI and XV,cycloartane derived saponins from Astragalus sieversianus |
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| Affiliation: | 1. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China;2. Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China;3. School of Agriculture and Environment, and Institute of Agriculture, The University of Western Australia, Crawley, WA 6009, Australia;1. Sobolev Institute of Mathematics SB RAS, Novosibirsk, Russia;2. Novosibirsk State University, Russia;3. Novosibirsk State University of Economics and Management, Russia;4. National Research University Higher School of Economics, St. Petersburg, Russia |
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| Abstract: | Sixteen triterpenoid saponins, astrasieversianins I–XVI, have been isolated from the methanol extract of the roots of Astragalus sieversianus. By heterogeneous acidic hydrolysis, all glycosides produced only one common aglycone which was identified as the known natural product astramembrangenin or cycloastragenol. On the basis of spectral analysis and chemical reactions, the structures of two new triterpenoid glycosides, astrasieversianin IX and XI, were assigned as the 3-0-[α-l-rhamnopyranosyl(1 → 2)]-(3'-O-acetyl)-β-d-xylopyranosyl-6-O-β-d-xylopyranoside and the 3-O-[α-l-rhamnopyranosyl(1 → 2)]-(4'-O-acetyl)-β-d-xylopyranosyl-6-β-d-xylopyranoside of cycloastragenol. Astrasieversianin XV was identified as the 20,24-epimer (20R,24S) of cyclosieversiside G (20S,24R). |
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