|Title||TRITERPENE CONSTITUENTS OF THE DWARF BIRCH, BETULA-GLANDULOSA|
|Publication Type||Journal Article|
|Year of Publication||1992|
|Authors||Williams, DE, Sinclair, ARE, Andersen, RJ|
|Type of Article||Article|
|Keywords||ANTIFEEDANT, 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|
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|