Triterpenoid Saponins from the Stem Bark of Acanthopanax brachypus HARMS

摘要

Two new triterpenoid saponins, brachyposide A (1) 13-043-n-galactopyranosyl-(1—>2)1/3-D-xylopyranosyl-(1—>3)141-n-glucuronopyranosyl-2A3A16a,23-tetrahydroxyolean-12-en-28-oic acid 28-043-D-apiofuranosyl-(1—>3)-P-D-xylopyranosyl-(1-->4)-a-L-rhamnopyranosyl-(1—>2)-a-L-arabinopyranosyl ester} and brachyposide B (2)13-043-a-glucopyranosyl-(1--)3)43-n-galactopyranosyl-(1-0)-/3-n-glucuronopyranosyl-2/3,3A23-trihydroxyolean-12-en-28-oic acid 28-0-P-o-xylopyranosyl-(1-44)-[0-o-apiofuranosyl-(1-->3)]-a-L-rhamnopyranosyl-(12)43-D-glucopyranosyl ester}, together with four known triterpenoid saponins, including tabguticoside A, nipponosideD, palmatoside E and ciwujianoside A1, were isolated from the stem bark of Acanthopanax brachypus. Theirstructures were elucidated on the basis of spectroscopic and chemical evidence.