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A further phytochemical investigation on the whole plants of Ypsilandra thibetica yielded three new spirostane glycosides, named ypsilandrosides M–O (1–3). Their structures were established as (3β,11α,25R)‐3,11‐dihydroxyspirost‐5‐en‐12‐one 3‐{O‐α‐L‐rhanmopyranosyl‐(1→4)‐O‐L‐rhanmopyranosyl‐(1→4)‐O‐[α‐L‐rhanmopyranosyl‐(1→2)]‐β‐D‐glucopyranoside} (1), (3β,7β,25R)‐spirost‐5‐ene‐3,7‐diol 3‐{O‐α‐L‐rhanmopyranosyl‐(1→4)‐...
Two new C22‐steroidal lactone glycosides, ypsilactosides A (1) and B (2), were isolated from the EtOH extract of the whole plant of Ypsilandra thibetica. Their structures were established as (3β,5α,16β,20S)‐3,16‐dihydroxy‐6‐oxopregnane‐20‐carboxylic acid γ‐lactone 3‐(β‐D‐glucopyranoside) (1) and (3β,16β)‐3,16‐dihydroxypregna‐5,20‐diene‐20‐carboxylic acid γ‐lactone 3‐{O‐α‐L‐rhamnopyranosyl‐(1→4)‐O‐...
Phytochemical reinvestigation on the whole plants of Ypsilandra thibetica obtained five new spirostane glycosides, ypsilandrosides H-L (1–5), and a known saponin polyphylloside III (6). Among them, 1 and 2 are the first spirostane glycosides which possess novel 5(6→7) abeo-steroidal aglycones. Compounds 3 and 4 are rare saponins whose aglycones contain a hydroxyl group at C-7. Their structures were...
A further phytochemical investigation on the whole plants of Ypsilandra thibetica yielded one sapogenin and 12 spirostanol saponins. Five of these are new compounds, designated as ypsilandrosides C-G (2–6). Their structures were determined by detailed spectroscopic analysis, including extensive 1D and 2D NMR data, and by the result of a hydrolytic reaction. Compounds 2–5 were rare steroidal saponins...
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