根茎
化学
糖苷
立体化学
薯蓣属
传统医学
医学
病理
替代医学
作者
Zulfıqar Ali,Troy J. Smillie,Ikhlas A. Khan
标识
DOI:10.1177/1934578x1300800310
摘要
Nine glycosides of spirostan (1–7) and furostan (8 and 9) type steroids including a new compound, 7-oxodioscin (1), were isolated from the rhizomes of Dioscorea nipponica. The structure of 1 was established as (25 R)-3β -O-[(α-L-rhamnopyranosyl-(1→4)- O-[α-L-rhamnopyranosyl-(1→2)]-β-D-glucopyranosyl)oxy]spirost-5-en-7-one by extensive spectroscopic techniques including HRESI-TOFMS, 1D and 2D NMR, and chemical methods. Known compounds were elucidated as dioseptemloside G (2), (25 R)-dracaenoside G (3), orbiculatoside B (4), dioscin (5), progenin III (6), gracillin (7), (3β,22α,25 R)–26-(β-D-glucopyranosyloxy)-22-methoxyfurost-5-en-3-yl O-[α-L-rhamnopyranosyl-(1→4)]-β-D-glucopyranoside (8), and methylprotodioscin (9).
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