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1.
Flekhter O. B. Boreko E. I. Nigmatullina L. R. Pavlova N. I. Nikolaeva S. N. Savinova O. V. Eremin V. F. Baltina L. A. Galin F. Z. Tolstikov G. A. 《Russian Journal of Bioorganic Chemistry》2003,29(3):296-302
New nitrogen-containing derivatives of betulinic and betulonic acids, hydrazides and N"-benzalhydrazides, were synthesized. Their antiviral activities toward viruses of influenza A virus, herpes simplex type I virus, enterovirus ECHO6, and HIV-1 were studied in vitro. Betulinic acid 3-oxime was found to have the highest activity against the influenza virus. Betulonic acid, betulinic acid 4-chlorobenzalhydrazide, betulonic acid 3-oxime benzalhydrazide, and betulinic acid hydrazide inhibited the replication of herpes simplex type I virus. Betulinic acid hydrazide also showed antiviral activity toward HIV-1. All the derivatives of betulinic acid under study displayed a low antiviral activity toward enterovirus ECHO6. 相似文献
2.
Kondratenko RM Baltina LA Baltina LA Baschenko NZh Tolstikov GA 《Bioorganicheskaia khimiia》2006,32(6):660-666
New glycopeptides of glycyrrhizic acid (GA) containing Glu residues and their alpha-methyl esters, gamma-methyl esters, and alpha,gamma-dimethyl esters were synthesized using N,N'-dicyclohexylcarbodiimide in the presence of N-hydroxybenzotriazole or N-hydroxysuccinimide. Formation of amide bonds was observed on all the three COOH groups of GA, or selectively on the COOH groups of the GA carbohydrate part in dependence on the ratio of reagents and the reaction conditions. The GA glycopeptide with three residues of Glu(OH)-OMe at a dose of 2 mg/kg stimulated the production of antibody-forming cells in mouse spleen in comparison with the control. The GA glycopeptide containing Glu residues only in the GA carbohydrate part turned out to be an immunosuppressor. The glycopeptide of the 30-methyl ester of GA with residues of free Glu in its carbohydrate part increased the hemagglutinine titer at oral doses of 2 and 10 mg/kg. All the studied compounds had practically no effect on the delayed-type hypersensitivity in mice. 相似文献
3.
Flekhter O. B. Karachurina L. T. Nigmatullina L. R. Sapozhnikova T. A. Baltina L. A. Zarudii F. S. Galin F. Z. Spirikhin L. V. Tolstikov G. A. Plyasunova O. A. Pokrovskii A. G. 《Russian Journal of Bioorganic Chemistry》2002,28(6):494-500
The assignment of NMR resonances of lupane triterpenoids was refined by the example of 3O,28O-dinicotinoylbetulin, obtained by acylation of betulin. Hepatoprotective, antiulcer, antiinflammatory, reparative, and anti-HIV activities were found for the compound. In addition, it was demonstrated to have immunomodulatory activity, for the first time detected among lupane triterpenoids. 相似文献
4.
O. B. Flekhter L. T. Karachurina V. V. Poroikov L. P. Nigmatullina L. A. Baltina F. S. Zarudii V. A. Davydova L. V. Spirikhin I. P. Baikova F. Z. Galin G. A. Tolstikov 《Russian Journal of Bioorganic Chemistry》2000,26(3):192-200
Hemisuccinates, hemiphthalates, acetylsalicylates, cinnamates, andp-methoxycinnamates of lupeol, betulin, and 3-O-acetylbetulin were synthesized via interaction with corresponding acid anhydrides or acid chlorides. A number of betulin
esters in position 3 and 28 were shown to exhibit a pronounced hepatoprotective effect similar to that of betulin and silibor.
These experimental data were in a good agreement with the computer prediction of their biological activity. Betulin 3,28-bishemiphthalate
was more effective than carsil in models of experimental hepatitis caused by carbon tetrachloride, tetracycline, and ethanol. 相似文献
5.
G A Tolstikov L A Baltina R M Kondratenko Kh M Nasyrov N Zh Baschenko 《Bioorganicheskaia khimiia》1989,15(3):392-398
Three triterpene glycopeptides, glycyrrhizic acid monomethly ester derivatives containing peptide fragment of N-acetylmuramoyldipeptide and its analogues, are synthesized. They possess high prednizolone-like antiinflammatory activity and display pronounced stimulative effect on humoral factors of immunity. 相似文献
6.
In this work, we studied the effect of vibratory stimulation of the foot support zones on the functional state of the leg muscles and the content of N2A titin isoforms in rats under simulated microgravity (suspension model). The results of this study showed that vibratory stimulation of the support zones of the rat foot in a gravity discharge may reduce the drop in the amplitude of leg muscle motor response and undesirable reduction of the titin content. 相似文献
7.
Flekhter O. B. Boreko E. I. Nigmatullina L. R. Tret'yakova E. V. Pavlova N. I. Baltina L. A. Nikolaeva S. N. Savinova O. V. Galin F. Z. Tolstikov G. A. 《Russian Journal of Bioorganic Chemistry》2003,29(6):594-600
Ureides and carbamates of betulinic acid and its derivatives were prepared in good yields by interaction of betulinic acid, betulonic acid, and betulonic acid 3-oxime with amines, amino acids, and alcohols. Ureides of betulonic acid containingL-Val and L-Met residues were found to be effective against herpes simplex type 1 virus. 相似文献
8.
Kazakova O. B. Smirnova I. E. Baltina L. A. Boreko E. I. Savinova O. V. Pokrovskii A. G. 《Russian Journal of Bioorganic Chemistry》2018,44(6):740-744
Russian Journal of Bioorganic Chemistry - The paper reports on the synthesis of a series of acyl derivatives of betulin and dihydroquinopimaric acid and the study of their antiviral activity... 相似文献
9.
Flekhter OB Boreko EI Nigmatullina LR Pavlova NI Nikolaeva SN Savinova OV Eremin VF Baltina LA Galin FZ Tolstikov GA 《Bioorganicheskaia khimiia》2003,29(3):326-332
New nitrogen-containing derivatives of betulinic and betulonic acids, hydrazides and N'-benzalhydrazides, were synthesized. Their antiviral activities toward of influenza A virus, herpes simplex type I virus, enterovirus ECHO6, and HIV-1 were studied in vitro. Betulinic acid 3-oxime was found to have the highest activity against the influenza virus. Betulonic acid, betulinic acid 4-chlorobenzalhydrazide, betulonic acid 3-oxime benzalhydrazide, and betulinic acid hydrazide inhibited the replication of herpes simplex type I virus. Betulinic acid hydrazide also showed antiviral activity toward HIV-1. All the derivatives of betulinic acid under study displayed a low antiviral activity toward enterovirus ECHO6. 相似文献
10.
Kondratenko RM Baltina LA Mustafina SR Vasil'eva EV Pompei R Deidda D Pliasunova OA Pokrovskiĭ AG Tolstikov GA 《Bioorganicheskaia khimiia》2004,30(3):308-315
Glycyrrhizic acid and its 30-methyl ester were conjugated with 2-amino-1,3,4,6-tetra-O-acetyl-2-deoxy-alpha-D-glucopyranose, 2,3,4,6-tetra-O-acetyl-beta-D-glucopyranosyl amine, 2,3,4-tri-O-acetyl-apha-L-arabinopyranosyl amine, 2-acetamido-2-deoxy-beta-D-glucopyranosyl amine, and beta-D-galactopyranosyl amine using N,N'-dicyclohexylcarbodiimide and its mixtures with N-hydroxybenzotriazole. Structures of the conjugates were confirmed by IR, UV, 1H, and 13C NMR spectroscopy. The glycoconjugate with the residues of 2-acetamido-2-deoxy-beta-D-glucopyranosyl amine in the carbohydrate part of its molecule exhibited antiviral activity (ID50 4 microg/ml) toward the herpes simplex type 1 virus (HSV-1) in the VERO cell culture. Two compounds demonstrated anti-HIV-1 activity (50-70% inhibition of p24) in a culture of MT-4 cells at concentrations of 0.5-20 microg/ml. The English version of the paper: Russian Journal of Bioorganic Chemistry, 2004, vol. 30, no. 3; see also http://www.maik.ru. 相似文献