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Journals and Conferences
Nine compounds including six cycloartane glycosides cyclosieversiosides A, B, F, G, and H and astrasieversianin IX; β-sitosterol, β-sitosterol β-D-glucopyranoside, and D-3-O-methyl-chiro-inositol were isolated and identified from roots of Astragalus sieversianus Pall. (Leguminosae) growing in the Republic of Kyrgyzstan.
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.
We are continuing research on triterpene glycosides of the cycloartane series that are produced by plants of the Astragalus genus (Leguminosae) . In the present communication, compounds of stipular astragalus (Astragalus stipulosus Boriss.) are described. The cycloartane glycosides askendoside B (1) [2, 3], D (2) [3, 4], G (3) , and saccharose were… (More)
The two trisdesmoside cycloartane glycosides astragaloside VII and cyclotrisectoside were isolated from Astragalus dissectus (Leguminosae) and identified. The latter was 20R,25-epoxy-24S-cycloartan-3β,6α,16β,24-tetraol 3-O-β-D-xylopyranoside-6,24-di-O-β-D-glucopyranoside and was a new natural compound.
We give an instability estimate for the Gel’fand inverse boundary value problem at high energies. Our instability estimate shows an optimality of several important preceeding stability results on inverse problems of such a type.
Ten pure compounds, three of which were identified as β-sitosterol, β-sitosterol β-D-glucopyranoside, and D-3-O-methyl-chiro-inositol, were isolated from roots of Astragalus macropus Bunge (Leguminosae). The structure of the new cycloartane triterpenoid cyclomacrogenin B was established as 24R-cycloartan-1α,3β,7β,24,25-pentaol.
Eight compounds of triterpenoid nature have been isolated from the epigeal parts of the plantAstragalus alopecurus Pall. (Leguminosae) and have been designated in order of increasing polarity as substance 1–8. On the basis of chemical transformations and spectral characteristics, we have established the structures of 4 and 8, which have been called… (More)
In continuation of research on cycloartane triterpenoids from plants of the genus Astragalus, we studied A. oldenburgii B. Fedtsch. (Leguminosae). Ground air-dried aerial parts (1.5 kg) of the plant collected in June 2004 in Surkhandar ya Oblast (Babatag) were extracted exhaustively with MeOH (5 8 L). The combined MeOH extracts were concentrated to a syrupy… (More)
In continuation of structural studies of cycloartane and lanostane triterpenoids isolated from plants of the genus Astragalus (Leguminosae), we determined the stereochemistry of asymmetric C-23 and C-24 in cycloorbicoside D (1) as 23R,24R using an x-ray crystal structure . The question of the absolute configuration of the same atoms in cycloorbigenin C… (More)
The content of triterpenoid glycosides has been studied in detail for more than 40 species of Astragalus growing in various parts of the world. Among these, the chemical structure of cycloartane methylsteroids of Astragalus orbiculatus Ledeb. is distinctive. In continuation of the study of isoprenoid plants of the Astragalus (Leguminosae) genus , we… (More)