Structure and Reactivity of the Dammarenyl Cation: Configurational Transmission in Triterpene Synthesis
作者:Quanbo Xiong、Flavio Rocco、William K. Wilson、Ran Xu、Maurizio Ceruti、Seiichi P. T. Matsuda
DOI:10.1021/jo050147e
日期:2005.7.1
The dammarenyl cation (13) is the last common intermediate in the cyclization of oxidosqualene to a diverse array of secondary triterpene metabolites in plants. We studied the structure and reactivity of 13 to understand the factors governing the regio- and stereospecificity of triterpene synthesis. First, we demonstrated that 13 has a 17β side chain in Arabidopsis thaliana lupeol synthase (LUP1) by
Abstract A new tetracyclic hexanortriterpene ketol, 3β-hydroxy-22,23,24,25,26,27-hexanordammaran-20-one, has been isolated from the whole herb of Euphorbiasupina .
Fujimoto,H.; Tanaka,O., Chemical and pharmaceutical bulletin, 1970, vol. 18, # 7, p. 1440 - 1445
作者:Fujimoto,H.、Tanaka,O.
DOI:——
日期:——
TANAKA, R.;MATSUDA, M.;MATSUNAGA, S., PHYTOCHEMISTRY, 26,(1987) N 12, 3365-3366
作者:TANAKA, R.、MATSUDA, M.、MATSUNAGA, S.
DOI:——
日期:——
Préparation de la 8,14-diméthyl 18-nor-testostérone
作者:Pierre Crabbé、Guy Ourisson、Takeyoshi Takahashi
DOI:10.1016/0040-4020(58)80024-1
日期:1958.1
A tetracyclic triterpene has been isolated from the oleoresins of four Dipterocarpus species. It has been identified with van Itallie's dipterocarpol and Mills' hydroxy-dammarenone-II (I). The side chain of dipterocarpol has been degraded to the methyl ketone (VII, R = H, by three different methods. Trifluoroperacetic acid converted the ketone into the 17-acetate (XXII, R = H, R′ = Ac), and ring A