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Two New Acylated Tridesmosidic Saponins from Astragalus armatus

✍ Scribed by Nabil Semmar; Miyamoto Tomofumi; Yassine Mrabet; Marie-Aleth Lacaille-Dubois

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

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✦ Synopsis

Abstract

Two new tridesmosidic glycosides of (3__β__,6__α__,16__β__,20__R__,24__S__)‐20,24‐epoxycycloartane‐3,6,16,25‐tetrol (=cycloastragenol), armatosides I and II (1 and 2, resp.), were isolated from the roots of Astragalus armatus (Fabaceae) as well as the known bidesmosidic glycosides of cycloastragenol, trigonoside II (3) and trojanoside H (4). Their structures were elucidated as (3__β__,6__α__,16__β__,20__R__,24__S__)‐3‐O‐(2,3‐di‐O‐acetyl‐β‐D‐xylopyranosyl)‐20,24‐epoxy‐25‐O‐β‐D‐glucopyranosyl‐6‐O‐β‐D‐xylopyranosylcycloartane‐3,6,16,25‐tetrol (1), and (3__β__,6__α__,16__β__,20__R__,24__S__)‐3‐O‐(2‐O‐acetyl‐β‐D‐xylopyranosyl)‐20,24‐epoxy‐25‐O‐β‐D‐glucopyranosyl‐6‐O‐β‐D‐xylopyranosylcycloartane‐3,6,16,25‐tetrol (2). These structures were established by extensive NMR and MS analyses and by comparison with literature data.

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