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Ypsilactosides A and B, Two New C22-Steroidal Lactone Glycosides from Ypsilandra thibetica

✍ Scribed by Yi Lu; Bai-Bo Xie; Chang-Xiang Chen; Wei Ni; Yan Hua; Hai-Yang Liu

Publisher
John Wiley and Sons
Year
2011
Tongue
German
Weight
183 KB
Volume
94
Category
Article
ISSN
0018-019X

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✦ Synopsis

Abstract

Two new C~22~‐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 (3__β__,5__α__,16__β__,20__S__)‐3,16‐dihydroxy‐6‐oxopregnane‐20‐carboxylic acid γ‐lactone 3‐(β‐D‐glucopyranoside) (1) and (3__β__,16__β__)‐3,16‐dihydroxypregna‐5,20‐diene‐20‐carboxylic acid γ‐lactone 3‐{O‐α‐L‐rhamnopyranosyl‐(1→4)‐O‐α‐L‐rhamnopyranosyl‐(1→4)‐O‐[α‐L‐rhamnopyranosyl‐(1→2)]‐β‐D‐glucopyranoside} (2) on the basis of extensive spectroscopic analyses and chemical degradations.

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