Cycloartane Glycosides from Astragalus falcatus of the Flora of Georgia

Chemistry of Natural Compounds - The structures of three cycloartane glycosides isolated from Astragalus falcatus Lam. that were cyclogalegigenin derivatives were elucidated. Compound 1 was...     

Triterpene Glycosides from Astragalus. Structure of Cyclounifolioside B from Astragalus unifoliolatus

The previously known astrailienin A and the new cycloartane glycoside cyclounifolioside B with structure cyclosiversigenin 3-O-[-D-glucopyranosyl(1-2)]--D-glucopyranoside were isolated from Astragalus unifoliolatus Bunge. The structures of these compounds were established using chemical transformations and two-dimensional spectra (ROESY, HMBC, HSQC, TOCSY, COSY).     

Flavonoids from Astragalus hamosus

A new flavonol glycoside 7-O-methyl-kaempferol 4'-beta-D-galactopyranoside (rhamnocitrin 4'-beta-D-galactopyranoside) (1) was isolated from the aerial parts of Astragalus hamosus. The known flavonols hyperoside (2), isoquercitrin (3) and astragalin (4) were also identified. Structures of the compounds were elucidated by chemical and spectral methods.     

Triterpenoids from Astragalus Plants

Advances in the chemistry of Astragalus triterpenoids based on worldwide literature appearing mainly after 1988 were reviewed. The review was dedicated to the memory of Professor N. K. Abubakirov.     

Triterpene glycosides of Astragalus and their genins XXXVII. Cycloaraloside F from Astragalus amarus and Astragalus villosissimus

The glycosides of the plantAstragalus villosissimus Bunge have been studied. Four glycosides have been isolated from the roots of this plant, and two of them have been identified as -sitosterol -D-glucopyranoside and cycloaraloside C. The most polar glycoside, which has also been isolated from the roots ofAstragalus amarus Pall., proved to be a new triterpene glycoside of the cycloartane series and has been called cycloaraloside F. It is a trioside of cyclosieversigenin containing two molecules of D-glucose and one molecule of D-apiose. On the basis of chemical transformations and spectral characteristics, the structure of cycloaraloside F has been established as 20R, 24S-epoxycycloartane-3,6,16,25-tetraol 3-0-[O-D-apio--D-furanosyl-(12)--D-glucopyranoside] 25-O--D-glucopyranoside.Institute of Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 3, pp. 374–377, May–June, 1991.     

Cyclogaleginoside D from Astragalus galegiformis stems

The new cycloartane glycoside cyclogaleginoside D, which has the structure 25-O-β-D-glucopyranoside-20S, 25R-epoxycycloartan-3β, 6α, 16β, 25-tetraol 3-O-β-D-(2-O-acetyl)xylopyranoside was isolated from Astragalus galagiformis stems. The structure of the glycoside was established using chemical transformations and IR, PMR, and ¹³C NMR spectral data. __________ Translated from Khimiya Prirodnykh Soedinenii, No. 3, pp. 255–256, May–June, 2006.