7-O-methyl-(2R:3R)-dihydroquercetin 5-O-β-D-glucoside and other flavonoids from Podocarpus nivalis

Phytochemistry
1984.0

Abstract

In the course of a chemotaxonomic survey of New Zealand Podocarpus species, a number of new tlavonoid glycosides have been isolated from P. niualrs. These are: luteolin 3'-0-fl-Dxyloside, luteolin 7-0-B-D-glucoside-3'-O-pt+xyloside, dihydroquercetin 7-0-/3-D-glucoside, 7-0-methyl-(2R : 3R)-dihydrokaempferol 5-0-8-Dglucopyranoside, 7-0-methyl-(2R : 3R)dihydroquercetm 5-0-fl-D-glucopyranoside, 7-0-methylkaempferol SO+Dglucopyranoside and 'I-0-methylquercetin 5-0-p-D-glucopyranoslde. Diagnostically useful physical techniques for distinguishing substitution patterns in dihydro!Iavonols are discussed and summarized. Glucosylation of the 5-hydroxyl group in ( + ) dihydroflavonols is shown to reverse the sign of rotation at 589 nm.

Knowledge Graph

Similar Paper