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1. (Article ID: 10914)
 
Li-Xian G, Xiao-Bing H, Yu-Qun C
Astrasieversianins IX, XI and XV, cycloartane derived saponins from Astragalus sieversianus
Phytochemistry 25 (1986) 1437-1441
 

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).

Leguminosae, triterpenoid saponins, Astragalus sieversianus, cycloartane triterpene, astrasieversianin, astrasieversiagenin

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2. (Article ID: 10915)
 
Li-Xian G, Xiao-Bing H, Yu-Qun C
The structures of thirteen astrasieversianins from Astragalus sieversianus
Phytochemistry 25 (1986) 2389-2393
 

Based on spectroscopic analysis and chemical degradations, the structures of the five new glycosides, astrasieversianins I, III, V, XII and XIII were assigned as the 3-O-(2′,3′,4′-tri-O-acetyl)-β-d-xylopyranoside, 3-O-(2′,4′,-di-O-acetyl-β-d-xylopyranoside, 3-O-(3′-O-acetyl)-β-d-xylopyranosyl-6-O-β-d-xylopyranoside, 3-O-α-l-rhamno-pyranosyl(1→2)]-(3t́-O-acetyl)-β-d-xylopyranosyl-6-O-β-d-glucopyranoside and 3-O-α-l-rhamnopyranosyl(1→2)]-(4′-O-acetyl)-β-d-xylopyranosyl-6-O-β-d-glucopyranoside of astramembrangenin, respectively. Astrasieversianins II, VI, X and XVI were established as 20,24-epimers of cyclosieversiosides A, C, E and H respectively. Astrasieversianins IV, VII, VIII and XIV were identified as known naturally occurring triterpenoid glycosides.

Leguminosae, triterpenoid saponins, Astragalus sieversianus, cycloartane triterpene, astrasieversianin

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