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Studies on the Chinese crude drug "shoma." IX. Three novel cyclolanostanol xylosides, cimicifugosides H-1, H-2 and H-5, from cimicifuga rhizome.


Koeda M, Aoki Y, Sakurai N, Nagai M




Chem Pharm Bull (Tokyo)


Three new cyclolanostanol xylosides were isolated from a batch of commercial Cimicifuga Rhizome, cimicifugoside H-1 (1), C35H52O9, mp 260-262 degrees C, [alpha]D -43.5 degrees, cimicifugoside H-2 (2), C35H54O10, mp 227-229 degrees C, [alpha]D -38.8 degrees, and cimicifugoside H-5 (3), C35H52O10, mp 262-264 degrees C, [alpha]D - 22.9 degrees, together with known glycosides, actein and 27- deoxyactein. Their structures were determined on the basis of chemical and spectrometric evidence including an X-ray crystallographic analysis. The structure of cimicifugoside H-1 (1) was established as (20R,24R)-24,25-epoxy-11 beta-hydroxy-3-beta-(beta- D- xylopyranosyloxy)-9,19-cyclolanost-7-ene-16,23-dione. Cimicifugoside H-5 (3) is the 15-hydroxylated derivative of 1. Since 1 changed into cimicifugoside H-2 (2) on treatment with p- toluenesulfonic acid, 2 has a 24R,25-diol structure derived from 1 by opening its epoxy ring.

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