Hydrolyzed Tannins of Euphorbia glareosa Leaves. Structure of Glarein C

The structure of glarein, a new hydrolyzed tannin from Euphorbia glareosa Pall. ex Bieb. leaves, was established using physicochemical properties of the compound itself, its hydrolysis products, and IR, UV, and PMR spectra.     

Triterpene glycosides ofAstragalus and their genins. XVI. Cyclogaleginosides A and B fromAstraglus galegiformis

Two glycosides of the cycloartane series — cyclogaleginosides A and B — have been obtained from inflorescences ofAstragalus galegiformis L. (Leguminosae), and their structures have been established by chemical transformations and spectral characteristics as cyclogalegigenin 3-O-(2-O-acetyl)--D-xylopyranoside and cyclogalegigenin 3-O--D-xylopyranoside, respectively.I. G. Kutateladze Institute of Pharmacochemistry, Academy of Sciences of the Georgian SSR, Tbilisi. Institute of the Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 4, pp. 477–481, July–August, 1984.     

Flavonoid glycosides from Astragalus galegiformis leaves

New flavonoid oligosides, the structures of which were established by chemical transformations and UV, IR, PMR, and ¹³C NMR spectra, were isolated from Astragalus galegiformis leaves. __________ Translated from Khimiya Prirodnykh Soedinenii, No. 6, pp. 555–558, November–December, 2006.     

Kinetics of the alkaline hydrolysis of flavonoid glycosides

Summary 1. In a study of the kinetics of the alkaline hydrolysis of flavone glycosides it has been found that derivatives of 3,3,4,5,7-pentahydroxyflavone hydrolyze faster than derivatives of 3,4,5,7-tetrahydroxyflavone and of 3,4,5,7-tetrahydroxy-3-methoxyflavone.2. In the hydrolysis of diglycosides of 3,3,4,5,7-pentahydroxyflavones the maximum amount of intermediate product is formed after 2 min (3,4,5,7-tetrahydroxyflavone glycoside), and in the case of 3,4,5,7-tetrahydroxy-3-methoxyflavone glycosides after 120–150 min.I. V. Kutateladze Institute of Pharmacochemistry, Academy of Sciences of the Georgian SSR, Tbilisi. Translated from Khimiya Prirodnykh Soedinenii, No. 5, pp. 646–649, September–October, 1977.