22(1728)abeo-Lupene derivatives 5a and 6a were obtained after the acid-catalyzed E-ring expansion of 3-acetylbetulin (1a). Glycosylation of these dehydrated triterpenoids using Schmidt's trichloroacetimidate sugar donors in the presence of trimethylsilyl trifluoromethanesulfonate (TMSOTf) provided the new anhydrobetulin saponins 7b-7e in which the terminal olefin C-20(29) isomerizes to form a C-19 tetrasubstituted alkene. The preliminary cytotoxic evaluation revealed that saponins 7b-7d exhibited a moderate cytotoxic activity against A549, DLD-1, and WS1 human cell lines with IC50 ranging from 22 to 49M.
Synthesis and antiviral activity of lupane triterpenoids with modified cycle E
作者:O. B. Flekhter、N. I. Medvedeva、O. S. Kukovinets、L. V. Spirikhin、E. G. Galkin、F. Z. Galin、D. G. Golovanov、N. I. Pavlova、O. V. Savinova、E. I. Boreko、G. A. Tolstikov
DOI:10.1134/s1068162007060088
日期:2007.11
A reductive transformation of the peroxide products of ozonolysis of derivatives of 3β-O-acetyl-22(17→28)-abeo-lupa-17(28),20(29)-diene and the subsequent intramolecular ketalization led to a compound with a trioxane fragment. This is a new approach to a skeletal modification of triterpenoid cycle E. An activity of the synthesized compounds was found toward the viruses of type A influenza and herpes
3β-O-乙酰基-22(17→28)-abeo-lupa-17(28),20(29)-二烯衍生物臭氧分解的过氧化物产物的还原转化和随后的分子内缩酮化导致了一种化合物三恶烷片段。这是一种对三萜循环 E 进行骨架修饰的新方法。发现合成的化合物对 A 型流感病毒和单纯疱疹病毒具有活性。
Protiva, Jiri; Krecek, Vaclav; Kreckova, Josefa, Collection of Czechoslovak Chemical Communications, 1983, vol. 48, # 3, p. 928 - 936