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Journals and Conferences
From an acid fraction of an ethereal extract of Siberian fir needles two new stereoisomeric acids, the molecules of which have a modified lanostane carbon skeleton, have been isolated in the form of… (More)
The composition of phenolic components of roots and rhizomes ofGlycyrrhiza uralensisFisch. from Siberia is studied. A total of 15 components belonging to 8 structural types including 4'… (More)
A series of 2-(4-R-triazolyl)substituted 3-oxo-2,3-dihydrofurocoumarins have been synthesized by a regioselective cycloaddition of 2-azidooreoselone 1 or… (More)
Dehydroisoleucomisin (anhydroaustricin) was converted in good yield to guai-1(10),3,5,7(11), 8-pentaen-2-on-12,8-olide by the action of anhydrous HCl in dry DMF. The chemical structure of the product… (More)
The bromination of betulin with bromine was descibed. The reaction in chloroform proceeded smoothly to form 29,30-dibromoallobetulin in 80% yield.
Allylic oxidation of phlomisoic acid and its methyl ester by selenium dioxide occurred stereoselectively to form 7α-hydroxy derivatives of labdanoids, which were oxidized by active manganese dioxide… (More)
13-Aryl-substituted tourneforin derivatives were synthesized via the Heck reaction with aryliodides. The structure of (E)-13-(3,4-dimethoxybenzyl)-eudesma-4(5),11(13)-dien-6α,12-olide was confirmed… (More)
Salts of 1,2,3-benzodithiazolium (1), 2,1,3-benzothiaselenazolium (3), and 1,2,3-benzodiselenazolium (4) (Herz cations), namely, [BF4], [SbCl6], [BF4], [GaCl4], [SbCl6], and… (More)
New derivatives of betulin, betulinic acid methyl ester, and their acetate analogs containing 1,2,3-triazole fragments in the C-30 position were synthesized. It was shown using the Ames test that… (More)
A novel eudesmane sesquiterpene lactone, the structure of which was established by XSA, was isolated from Artemisia tournefortiana.