New triterpenoids from the leaves of Tetrapanax papyriferum

Abstract

Four new triterpenoids, papyriogenins D (3), E (4), F (5), and G (6), isolated from ether extracts of the fresh leaves of Tetrapanax papyriferum(Araliaceae), were identified as 21α-hydroxy-3-oxo-oleana-11,13(18)-dien-28-oic acid, 3α,21α-dihydroxyoleana-11,13(18)-dien-28-oic acid, 3α-hydroxy-21-oxo-olean-12-en-28-oic acid, and 3α,21α-dihydroxyoleana-11,13(18)-dieno-22β,28-lactone, respectively, by spectroscopic evidence and chemical correlations.