Determination of the absolute configuration of carbohydrate components of flavonol glycosides of the chestnut
On the basis of the rates of their acid hydrolysis, their optical activities, and their IR spectra, it has been established that the glycosides ofAesculus hippocastanum L. are (SK-1) 3-α-L-arabofuranosyloxy-5,7,4′-trihydroxyflavone, (SK-2) 3-α-L-rhamnofuranosyloxy-5,7,4′-trihydroxyflavone, (SK-3) 3-α-L-arabofuranosyloxy-5,7,3′,4′-tetrahydroxyflavone, and (SK-4) 3-α-L-rhamnofuranosyloxy-5,7,3′,4′-tetrahydroxyflavone.
The glycoside SK-3 is identical with avicularin isolated from the leaves ofPsidium quajava . The complete structures of the other three glycosides have been established for the first time.
KeywordsGlycoside Quercetin Kaempferol Absolute Configuration Flavonol Glycoside
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