55866-28-9Relevant academic research and scientific papers
24,24-DIMETHYL-25-DEHYDROLOPHENOL, A 4α-METHYLSTEROL FROM CLERODENDRUM INERME
Akihisa, Toshihiro,Ghosh, Parthasarathi,Thakur, Swapnadip,Nagata, Hiroshi,Tamura, Toshitake,Matsumoto, Taro
, p. 1639 - 1641 (1990)
The structure of a new 4α-methylsterol isolated from aerial parts of Clerodendrum inerme has been shown to be 4α,24,24-trimethyl-5α-cholesta-7,25-dien-3β-ol (24,24-dimethyl-25-dehydrolophenol) based mainly on the 1H NMR spectroscopic comparison with known compounds.In addition 24β-ethyl-25-dehydrolophenol and two other common 4α-methylstyrols were isolated and identified.
Obtusifoliol and related steroids from the whole herb of Euphorbia chamaesyce
Tanaka, Reiko,Kasubuchi, Kazuaki,Kita, Shunji,Matsunaga, Shunyo
, p. 457 - 463 (1999)
Two new ergostane-type steroids were isolated together with two known compounds, obtusifoliol and 4α,14α-dimethyl-5α-ergosta-7,9(11),24(28)- trine-3β-ol, from the whole herb of Euphorbia chamaesyce. The structures of the new compounds were established as 3β-hydroxy-4α,14α-dimethyl-5α- ergosta-8,24(28)-dien-7-one and 3β-hydroxy-4α,14α-dimethyl-5α-ergosta- 8,24(28)diene-7,11-dione on the basis of chemical and spectral evidence.
4α,14α-DIMETHYL-5α-ERGOSTA-7,9(11),24(28)-TRIEN-3β-OL FROM PHASEOLUS VULGARIS AND GYNOSTEMMA PENTAPHYLLUM
Akihisa, Toshihiro,Kokke, W. C. M. C.,Yokota, Takao,Tamura, Toshitake,Matsumoto, Taro
, p. 1647 - 1651 (1990)
The structure of a new 4α-methylsterol isolated from the immature seeds of Phaseolus vulgaris and the aerial parts of Gynostemma pentaphyllum has been shown to be 4α,14α-dimethyl-5α-ergosta-7,9(11),24(28)-trien-3β-ol by spectroscopic methods and by chemical correlation with obtusifoliol.This appears to be the first report of the isolation of a 4α-methylsterol with a Δ7,9(11)-diene system from nature.Abundances and chromatographic data of all identified 4α-methylsterols isolated from G. pentaphyllum are also given.
Triterpenes issus des latex des euphorbes cactoides marocaines E. resinifera, E. echinus et E. officinarum : isolement, etude comparative par RMN (13)C des quatre classes tetracycliques, eupho-lanostane, elemo-lanostane, lanostane, et nor-31 lanostane
Harref, A. Ben,Lavergne, J.-P.
, p. 965 - 972 (2007/10/02)
The latex of moroccan Euphorbia : E. resinifera, E. echinus et E. officinarum has been examined for triterpene content.Three tetracyclic triterpenes from E. resinifera and ten penta or tetracyclic triterpenes including 4α-methyl sterols from E. echinus and E. officinarum, have been isolated.The carbon-13 NMR spectra have been recorded and all carbon shifts have been assigned for representatives of the four classes of tetracyclic triterpenes.It has been found that the differences in the 3-C, 9-C, 17-C, 20-C and 21-C chemical shifts for these triterpenes are remarkable, being significant for the characterization of the four classes.
