Abstract
Abstract Methyl 2α,3β,23-triacetoxy-13αH-olean-18-en-28-oate (4) and methyl 2α,3β-diacetoxy-13αH-olean-18-en-28-oate (7) were obtained from methyl 2α,3β,23-triacetoxy-19-oxoolean-12-en-28-oate (2) and from methyl 2α,3β-diacetoxy-19-oxoolean-12-en-28-oate (5), respectively, by the forced Wolff-Kishner reduction and subsequent acetylation and methylation. Methyl 2α,3β-diacetoxy-13βH-olean-18-en-28-oate (10), prepared from methyl 2,3-di-O-acetylarjunate (13) via methyl 2α,3β-diacetoxy-19α-hydroxy-12-oxooleanan-28-oate (18) and methyl 2α,3β-diacetoxy-19α-hydroxyoleanan-28-oate (19), was shown to be not identical with 7. This led to a 13αH-olean-18-ene structure for 7.
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