Triterpenoid glycosides from Cephalaria transsylvanica.
Maneno muhimu
Kikemikali
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-O-[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-O-[beta-D-glucopyranosyl (1-->3)-alpha-L-rhamnopyranosyl (1-->4)-beta-D-xylopyranosyl]-28-O-[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-O-[beta-D-glucopyranosyl (1-->3)-alpha-L- rhamnopyranosyl (1-->4)-beta-D-xylopyranosyl]-3 beta,23-dihydroxy delta 12-oleanen-28-carboxylic acid.
