Unsaturated E-ring triterpenes from rubus pinfaensis

Two new isomeric unsaturated E-ring pentacyclic triterpenoids have been isolated from the roots of Rubus pinfaensis. These triterpenes, glucosides of 2α,3β,23-trihydroxyurs- 12-en-28-oic acids with additional Δ 18 or Δ 19 unsaturation, were hydrolysed to the previously unreported pinfaenoic and isop...

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Bibliographic Details
Published in:Phytochemistry (Oxford) 1996-05, Vol.42 (2), p.505-508
Main Authors: Durham, David G., Liu, Iain X., Richards, R.Michael E.
Format: Article
Language:English
Subjects:
Biological and medical sciences
Chemical constitution
Fundamental and applied biological sciences. Psychology
Plant physiology and development
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Summary:Two new isomeric unsaturated E-ring pentacyclic triterpenoids have been isolated from the roots of Rubus pinfaensis. These triterpenes, glucosides of 2α,3β,23-trihydroxyurs- 12-en-28-oic acids with additional Δ 18 or Δ 19 unsaturation, were hydrolysed to the previously unreported pinfaenoic and isopinfaenoic acids, which, on acetylation and methylation, were converted into methyl triacetoxy-esters (methyl 2α,3β,23-triacetoxyursa- 12, 18-or -12,19-dien-28-oates), allowing purification and characterization by 13C and 1H NMR techniques. The possibility of these triterpenoids arising as artefacts of the isolation process has been addressed.
ISSN:0031-9422
1873-3700
DOI:10.1016/0031-9422(96)00016-7