Author:
Bannon CD,Eade RA,James P,McKenzie GP,Simes JJH
Abstract
The sapogenin mixture
prepared from the extract of the wood of Castanospermum
australe Cunn. & Fras.
has been shown to contain the known triterpenes 2β,3β-dihydroxyolean-12-en-28-oic
acid and 3β- hydroxyolean-12-ene-23,28-dioic acid; the latter also occurs
as the free triterpene. The identity of methyl 2β,3β-dihydroxyolean-12-en-28-
oic acid has been established by a high yielding
stereospecific synthesis starting from methyl crategolate; this synthesis at
the same time confirmed the revised configurations assigned from N.M.R.
evidence1 to the hydroxy groups in the two cis-2,3-diols of the
isomeric methyl 2,3-dihydroxyolean-12-en-28-oates. The identity of methyl
3β- hydroxyolean-12-ene-23,28-dioate has been established by comparison
with a specimen prepared by an unambiguous synthesis from dimethyl
medicagenate.
Cited by
7 articles.
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