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Secocycloartane Triterpenoidal Saponins from the Leaves of Astragalus membranaceusBunge

✍ Scribed by Haixue Kuang; Yoshihito Okada; Bingyou Yang; Zhenkun Tian; Tohru Okuyama

Publisher
John Wiley and Sons
Year
2009
Tongue
German
Weight
219 KB
Volume
92
Category
Article
ISSN
0018-019X

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✦ Synopsis

Abstract

magnified image

Two new 9,10‐secocycloartane triterpenoidal saponins, named huangqiyenins E (1) and F (2) were isolated from the leaves of Astragalus membranaceus Bunge. Enzymatic hydrolysis of 1 and 2 afforded the aglycones huangqiyegenins III (3) and IV (4), resp. Further alkaline hydrolysis of 3 provided trideacetylhuangqiyegenin III (5). Their structures were established by detailed spectroscopic analysis as (3__S__,5__R__,6__S__,10__R__,12__β__,16__β__,24__E__)‐26‐(β‐D‐glucopyranosyloxy)‐10,16‐dihydroxy‐4,4,14‐trimethyl‐9,19‐cyclo‐9,10‐secocholesta‐9(11),24‐diene‐3,6,12‐triyl triacetate (1), (3__S__,5__R__,6__S__,10__R__, 16__β__,24__E__)‐26‐(β‐D‐glucopyranosyloxy)‐10,16‐dihydroxy‐4,4,14‐trimethyl‐9,19‐cyclo‐9,10‐secocholesta‐9(11), 24‐diene‐3,6‐diyl diacetate (2), (3__S__,5__R__,6__S__,10__R__,12__β__,16__β__,24__E__)‐10,16,26‐trihydroxy‐4,4,14‐trimethyl‐9,19‐cyclo‐9,10‐secocholesta‐9(11),24‐diene‐3,6,12‐triyl triacetate (3), (3__S__,5__R__,6__S__,10__R__,16__β__,24__E__)‐10,16,26‐trihydroxy‐4,4,14‐trimethyl‐9,19‐cyclo‐9,10‐secocholesta‐9(11),24‐diene‐3,6‐diyl diacetate (4), and (3__S__,5__R__, 6__S__,10__R__,12__β__,16__β__,24__E__)‐4,4,14‐trimethyl‐9,19‐cyclo‐9,10‐secocholesta‐9(11),24‐diene‐3,6,10,12,16,26‐hexol (5), resp.

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