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Phytochem Anal. 2006 Jan-Feb;17(1):20-4.

Structural studies of zoospore attractants from Trachelospermum jasminoides var. pubescens: taxifolin 3-O-glycosides.

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School of Pharmaceutical Sciences, Kyushu University of Health and Welfare, Yoshino-machi, Nobeoka City, Miyazaki 882-8508, Japan.


(2S, 3S)-Taxifolin 3-O-arabinoside, a new dihydroflavonol glycoside, together with the known substances, (2R 3R)-taxifolin 3-O-arabinoside, astragalin, isoquercitrin, and cosmosiin, were isolated from the leaves of Trachelospermum jasminoides var. pubescens. Structural elucidation was carried out by spectroscopic methods, and the absolute configurations of C-2 and C-3 in taxifolin 3-O-arabinosides were determined on the basis of circular dichroism. Unlike the dihydroflavonol glycosides, (2R 3R)-taxifolin 3-O-glucoside and (2R, 3R-taxifolin 3-O-arabinoside, the novel (2S, 3S)-taxifolin 3-O-arabinoside is not effective as a zoospore attractant of the plant pathogenic fungus Aphanomyces cochlioides.

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