Triterpenoid Glycosides From Cephalaria-Transsylvanica

On the basis of spectroscopic and chemical methods, the structures of two new triterpenoid glycosides, transsylvanoside E and F, isolated from Cephalaria transsylvanica have been established as 3-0-[beta-D-xylopyranosyl (1 --> 3)-alpha-L-rhamnopyranosyl (1 --> 4)-beta-D-glucopyranosyl (1 --> 4)-beta-D-glucopyranosyl (1 --> 2)-beta-D-xylopyranosyl]-3 beta,23-dihydroxy Delta(12)-oleanen-28-carboxylic acid and 3-0-[beta-D-glucopyranosyl (1 --> 3)-alpha-L-rhamnopyranosyl (1 --> 4)-beta-D-xylopyranosyl]-28-0-[beta-D-glucopyranosyl (1 --> 4)-beta-D-glucopyranosyl]-3 beta,23-dihydroxy Delta(12)-oleanen-28-carboxylic acid, respectively. A new proglycoside was isolated from the cleavage of the ester-glycoside linkage and it's structure characterized as 3-0-[beta-D-glucopyranosyl (1 --> 3)-alpha-L-rhamnopyranosyl (1 --> 4)-beta-D-xylopyranosyl]-3 beta,23-dihydroxy Delta(12)-oleanen-28-carboxylic acid.