Potential allelopathic lupane triterpenes from bioactive fractions of melilotus messanensis*
摘要:
The aerial parts of Melilotus messanenis (sweet clover) afforded, from the medium polar bioactive fractions, in addition to the known lupane triterpenes lupeol, betulin, betulin aldehyde and betulinic acid, the new norlupane messagenin (30-norlupane-3 beta,28-diol-20-one) which have been tested as allelochemicals. Structures and their stereochemistries were elucidated by spectral methods and chemical transformations. Messagenin has been synthesized from betulinic acid. The effect of a series of aqueous solutions at 10(-4)-10(-9) M of eight natural and synthetic lupane derivatives were tested for their effects on the germination and growth of the dicotyledon species Lactuca sativa and Lepidium sativum and the monocotyledon species Hordeum vulgare and Triticum aestivum. All eight lupane triterpenes possess potential allelopathic activity in particular over dicotyledon species and they are likely to be significantly involved in the allelopathic action of Melilotus messanensis.
Synthesis of triterpenoid acylates: Effective reproduction inhibitors of influenza A (H1N1) and papilloma viruses
作者:O. B. Kazakova、N. I. Medvedeva、I. P. Baikova、G. A. Tolstikov、T. V. Lopatina、M. S. Yunusov、L. Zaprutko
DOI:10.1134/s1068162010060142
日期:2010.11
The synthesis of a new group of triterpenoid acylates has been conducted on the basis of oleanolic, glycyrrhetic, and ursolic acids and betulin. 28-ortho-Methoxycynnamoylbetulin has been demonstrated to possess high activity against the influenza type A (H1N1) virus with the selectivity index SI > 100 while studying the activity of the synthesized compounds in relation to the reproduction of viral
以齐墩果酸、甘草次酸、熊果酸和桦木脑为基础合成了一组新的三萜酰化物。在研究合成化合物与呼吸道感染病毒病原体繁殖相关的活性时,28-ortho-Methoxycynnamoylbetulin 已被证明对甲型流感 (H1N1) 病毒具有高活性,选择性指数 SI > 100。3,28-二烟酰桦木素对乳头状瘤病毒(HPV-11 株)具有高活性,选择性指数 SI 35。
Zur Kenntnis der Triterpene. (55. Mitteilung). Über Oxydationsprodukte von Betulin und von Betulin-diacetat
作者:L. Ruzicka、M. Brenner
DOI:10.1002/hlca.194002301156
日期:——
Zur Kenntnis der Triterpene. (64. Mitteilung). Abbau des Betulin-diacetats mit Ozon
作者:L. Ruzicka、Ed. Rey
DOI:10.1002/hlca.19420250118
日期:1942.2.2
Selective Oxidation of Triterpene Alcohols by Sodium Hypochlorite
作者:O. B. Flekhter、O. Yu. Ashavina、I. E. Smirnova、L. A. Baltina、F. Z. Galin、N. N. Kabal'nova、G. A. Tolstikov
DOI:10.1023/b:conc.0000033930.76751.b7
日期:2004.3
3-Oxo-triterpenoids were prepared by oxidation of the methyl esters of glycyrrhetic acid, allobetulin, and 20-oxo-29-nor-betulin with sodium hypochlorite in acetic acid or methylene chloride under phase-transfer conditions.
Vystrcil,A.; Budesinsky,M., Collection of Czechoslovak Chemical Communications, 1970, vol. 35, p. 295 - 311