Dihydroquercetin 3-acetate 4’-

Dihydroflavonols. Widely distributed 2,3-dihydroflavon-3-ols include the antioxidant 2,3-dihydroflavonols aromadendrin (3,5,7,4 -tetrahydroxyflavanone 2,3-dihydrokaempferol), ampelopsin (3,5,7,3, 4, 5 -hexahydroxyflavanone 2,3-dihydromyricetin), fustin (3,7,3, 4 -tetrahydroxyflavanone 2,3-dihydrofisetin) and taxifolin (3,5,7,3, 4 -pentahydroxy-flavanone 2,3-dihydroquercetin). Some flavanols are sweet-tasting, notably 6-methoxy-aromadendrin 3-O-aceate, 6-methoxytaxifolin and taxifolin 3-0-acetate. Taxifolin and fustin inhibit NADH and succinate dehydrogenases and taxifolin inhibits 5-LOX. 

The seeds of Aframomum hanburyi K. Schum. (Zingiberaceae) are used as an antidote and ingredient in certain medicinal preparations in Cameroon [93]. From an acetone extract of the seeds of this plant, two sweet dihydroflavonols, 3-acetoxy-5,7-dihydroxy-4 -methoxyflavanone (68) and 2/ ,3/ -(+)-3-acetoxy-5,7,4 -trihydroxyflavanone (69), were isolated [93]. 3-Acetoxy-5,7-dihydroxy-4 -methoxyflavanone (68) was previously isolated from a different species, Aframomum pruinosum Gagnepain [112]. However, the sweetness intensities of these compounds were not indicated [93,112]. The previously known 2R,2>R)-dihydroquercetin 3-0-acetate (71) which was rated as 80 times sweeter than sucrose, was isolated from Tessaria dodoneifolia (Hook. Am.)... 

Dihydroquercetin 3-O-acetate 4 -methyl ethei (70) Tessaria dodoneifolia (Hook. Am.) Cabrera (Compositae) 400 20... 

A,3/J)-Dihydroquercetin 3-O-acetate (71) T. dodoneifolia, Hymenoxys turneri K. Parker (Compositae) 80 20... 

Dihydropyranes, 236, 258 Dihydroquercetin, 351, 352 Dihydroquinidine acetate, 291 Dihydro tetrakis(tri-n-bu tylphosphine)-ruthenium(II), 148... 

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