Journal
JOURNAL OF ORGANIC CHEMISTRY
Volume 72, Issue 9, Pages 3500-3509Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jo070116e
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Hyptatic acid-A (32), a 2 alpha,3 beta,24-trihydroxyolean-12-en-28-oic acid, previously isolated from Hyptis capitata, was obtained from maslinic acid (2). The regioselective cyclopalladation of the axial methyl group on C-4 of maslinic acid afforded the C-24 hydroxymethylene group due to the presence of a C-2-OR substituent. Nevertheless, hederagenin (7) (23-hydroxy derivative) was formed when this oxygenated group was not present.
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