抄録
Steroid glycosides in dried rhizomes of Paris polyphylla SM. obtained in a market of Katmandu, Nepal, were investigated. Diosgenin 3-O-α-L-rhamnopyranosyl-(1→2)-[α-L-arabinofuranosyl-(1→4)]-β-D-glucopyranoside (I), mp 276-278°(decomp.), [α] D-133.0°, diosgenin 3-O-α-L-rhamnopyranosyl-(1→4)-α-L-rhamnopyranosyl-(1→4)-[α-L-rhamnopyranosyl-(1→2)]-β-D-glucopyranoside (V), mp 203-206°(decomp.), [α] D-153.2°, and pregna-5, 16-dien-3β-ol-20-one 3-O-β-chacotrioside (IX), mp 260-262°(decomp.), [α] D-72.2°, together with dioscin (diosgenin 3-O-β-chacotrioside) (VII), were isolated and characterized. I is the first diosgenin glycoside to have a L-arabinose unit and that in the furanose type, and V is a new tetraglycoside which could be regarded as a probable parent saponin of co-existing VII. IX attracts a particular attention in that the sugar moiety and the aglycone are respectively identical with and closely related to those of VII. Co-occurrence of the proto-type compounds of I and VII was also suggested.
