Triterpene Glycosides ofAstragalusand Their Genins. LXI. Occurrence of Cycloartane 6-O-Monodesmosides View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2000-07

AUTHORS

I. A. Sukhina, M. A. Agzamova, B. A. Imomnazarov, M. I. Isaev

ABSTRACT

Cyclosiversigenin 6-O-α-L-rhamnopyranoside and 6-O-β-D-glucopyranoside were isolated fromAstragalus coluteocarpusBoiss. (Leguminosae) andAstragalus dissectusB. Fedtsch. et N. Ivanova, respectively. Cyclosiversigenin 5-O-α-L-rhamnopyranoside was shown to be an artifact forAstragalus coluteocarpus.Thus, the cyclosiversigenin 6-O-β-D-glucopyranoside that was isolated from certainAstragalusspecies is hypothesized also to be an artifact. Glycosylation of the 6α -hydroxyl group of cycloartanes by D-glucose and D-xylose, in contrast with other substituents, does not change the low-field position of the PMR signal of the 4α-CH3group (1.65 ≤ δ ≤ 2.01 ppm) that is caused by the influence of deuteropyridine directly on the 6 -hydroxyl. Obviously one of the hydroxyls of the β-D-glucopyranoside or β-D-xylopyranoside residues has the same effect in this instance. More... »

PAGES

373-376

Identifiers

URI

http://scigraph.springernature.com/pub.10.1023/a:1002840829976

DOI

http://dx.doi.org/10.1023/a:1002840829976

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1018027638


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