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Three New Polyoxypregnane Glycosides from Marsdenia tenacissima

✍ Scribed by Jun Deng; Zhixin Liao; Daofeng Chen

Publisher
John Wiley and Sons
Year
2005
Tongue
German
Weight
108 KB
Volume
88
Category
Article
ISSN
0018-019X

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✦ Synopsis

Abstract

Three new polyoxypregnane glycosides, marsdenosides I–K (1–3), were isolated from the stem of Marsdenia tenacissima. The structures were elucidated on the basis of in‐depth spectroscopic analyses, and by means of chemical evidence. Marsdenoside I (= (3__β__,5__α__,11__α__,12__β__,14__β__,17__α__,20__R__)‐3‐[(2,6‐dideoxy‐4‐O‐(6‐deoxy‐3‐O‐methyl‐β‐D‐allopyranosyl)‐3‐O‐methyl‐β‐D‐arabino‐hexopyranosyl)oxy]‐8,20 : 11,20‐diepoxypregnane‐12,14‐diol; 1) is the first C~21~ steroidal glycoside with a rigid cage. Also, the isolation of 1 demonstrated that tenacigenin A (1a) is a true natural product as well, rather than an artifact.

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