Cycloartane Glycosides from Euphorbia boissierana

Two known (1 and 2) and two new (3 and 4) bisdesmoside cycloartane glycosides were isolated by fractionation of total extracted compounds from rhizomes of Euphorbia boissierana Prokh. (Euphorbiaceae). Chemical transformations, physical constants, and spectral data characterized the new glycosides as 3-O-β-D-(2′-OAc)-xylopyranosyl-6-O-β-D-xylopyranosyl-3β,6α,16β,24(R),25-pentahydroxycycloartane (3) and 3-O-β-D-(2′-OAc)-xylopyranosyl-6-O-β-D-glucopyranosyl-3β,6α,16β,24(R),25-pentahydroxycycloartane (4).