Structural studies of zoospore attractants from Trachelospermum jasminoides var. pubescens: taxifolin 3-O-glycosides.
(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.
Hosoi
Shinzo
S
School of Pharmaceutical Sciences, Kyushu University of Health and Welfare, Yoshino-machi, Nobeoka City, Miyazaki 882-8508, Japan.
Shimizu
Eri
E
Ohno
Kosei
K
Yokosawa
Ryozo
R
Kuninaga
Shiro
S
Coskun
Maksut
M
Sakushima
Akiyo
A
D029062:Apocynaceae / Q000737:chemistry*; D002851:Chromatography, High Pressure Liquid; D002942:Circular Dichroism; D006027:Glycosides / Q000737:chemistry*; D015394:Molecular Structure; D018515:Plant Leaves / Q000737:chemistry; D016339:Spectrometry, Mass, Fast Atom Bombardment; D013056:Spectrophotometry, Ultraviolet
D006027:Glycosides