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Three New C21 Steroidal Glycosides from the Stems of Marsdenia tenacissima

✍ Scribed by An-Yuan Zhang; Xin Huang; Ai-Min Tan; Shi-Bo Yang; Hua Zhang

Publisher
John Wiley and Sons
Year
2010
Tongue
German
Weight
189 KB
Volume
93
Category
Article
ISSN
0018-019X

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✦ Synopsis

Abstract

Three new glycosides, (3__β__,5__α__,8__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]‐12‐O‐tigloyl‐8,20 : 11,20‐diepoxypregnane‐12,14‐diol (1), (3__β__,5__α__,8__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]‐12‐O‐(2‐methylbutanoyl)‐8,20 : 11,20‐diepoxypregnane‐12,14‐diol (2), and (3__β__,5__α__,11__α__,12__β__,14__β__,17__α__)‐12‐acetoxy‐3‐[(2,6‐dideoxy‐4‐O‐(6‐deoxy‐3‐O‐methyl‐β‐D‐allopyranosyl)‐3‐O‐methyl‐β‐D‐arabino‐hexopyranosyl)oxy]‐20‐oxo‐8,14‐epoxypregnan‐ 11‐yl isobutyrate (3) were isolated from the stems of Marsdenia tenacissima. The structures of the new compounds were elucidated by means of spectral data, including HR‐ESI‐MS, and 1D‐ and 2D‐NMR.

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## 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_