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New Triterpenoid Saponins from Achyrantes asperaLinn.

✍ Scribed by Günter Michl; Dawit Abebe; Franz Bucar; Asfaw Debella; Olaf Kunert; Martin G. Schmid; Efrem Mulatu; Ernst Haslinger

Publisher
John Wiley and Sons
Year
2000
Tongue
German
Weight
82 KB
Volume
83
Category
Article
ISSN
0018-019X

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✦ Synopsis

Two new bisdesmosidic triterpenoid saponins, i.e. 1 and 2, were isolated, besides the three known saponins 3 ± 5, from the MeOH extract of the aerial parts of Achyranthes aspera Linn. (Amaranthaceae). Their structures were elucidated as

  1. by NMR spectroscopy, including 2D-NMR experiments (machaerinic acid 3b,21b-dihydroxyolean-12-en-28-oic acid). The other saponins were identified as b-d-glucopyranosyl 3b[O-a-l-rhamnopyranosyl-(1 3 3)-O-b-d-glucopyranuronosyloxy]oleanolate (3), b-d-glucopyranosyl 3-b-[O-b-d-galactopyranosyl-(1 3 2)-O-b-d-glucopyranuronosyloxy]oleanolate (4), and b-d-glucopyranosyl 3b-[O-b-d-glucopyranuronosyloxy]oleanolate (5) (oleanolic acid 3b-hydroxyolean-12-en-28-oic acid).

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