Pregnane- and furostane-type oligoglycosides from the seeds of Allium tuberosum

Abstract

Two furostane-type steroidal oligoglycosides (1, 2), together with a new pregnane-type oligoglycoside (3), were obtained from the seeds of Allium tuberosum ROTTLER. On the basis of spectroscopic analysis, the structures of three new oligoglycosides (1-3) were elucidated as 26-O-β-D-glucopyranosyl- (25R)-3β,22ξ,26-trihydroxyl-5α-furostane 3-O-β-chacotrioside, 26-O-β-D-glucopyranosyl-(25S)-3β,5β,6α,22ξ,26- pentahydroxyl-5β-furostane 3-O-α-L-rhamnopyranosyl-(1→4)-β- D-glucopyranoside, and 3-O-α-L-rhamnopyranosyl-(1→4)-β-D- glucopyranosyl 3β,5β,6α,16β-tetrahydroxypregnane 16-(5-O-β-D-glucopyranoyl-4(S)-methyl-5-hydroxypentanoic acid) ester, respectively. © 2004 Pharmaceutical Society of Japan.