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TRITERPENE CONSTITUENTS OF THE DWARF BIRCH, BETULA-GLANDULOSA

TitleTRITERPENE CONSTITUENTS OF THE DWARF BIRCH, BETULA-GLANDULOSA
Publication TypeJournal Article
Year of Publication1992
AuthorsWilliams, DE, Sinclair, ARE, Andersen, RJ
JournalPhytochemistry
Volume31
Pagination2321-2324
Date PublishedJul
Type of ArticleArticle
ISBN Number0031-9422
KeywordsANTIFEEDANT, BETULA-GLANDULOSA, DAMMAR-24-ENE-12-BETA-O-ACETYL-20(S)-OL-3-ONE, DEACETOXYPAPYRIFERIC ACID, DETER BROWSING, LEPUS-AMERICANUS, NMR, PAPER BIRCH, PAPYRIFERIC ACID, SNOWSHOE HARES
Abstract

Juvenile stages of the dwarf birch, Betula glandulosa, from the Yukon, Canada, are rarely browsed by snowshoe hares (LePus americanus). Chemical investigation of extracts of B. glandulosa which strongly deter browsing by snowshoe hares has led to the isolation and structure determination of the new metabolite, deacetoxypapyriferic acid. Dammar-24-ene-12-beta-O-acetyl-20(S)-ol-3-one, a previously unknown natural product, was obtained from extracts which did not deter browsing. The known metabolite papyriferic acid was found to be a minor constituent of extracts of B. glandulosa.

URL<Go to ISI>://A1992JC92000016