Phytochemistry p. 2049 - 2052 (1984)
Update date:2022-09-26
Topics:
Markham, Kenneth R.
Webby, Rosemary F.
Vilain, Christian
In the course of a chemotaxonomic survey of New Zealand Podocarpus species, a number of new flavonoid glycosides have been isolated from P. nivalis.These are: luteolin 3'-O-β-D-xyloside, luteolin 7-O-β-D-glucoside-3'-O-β-D-xyloside, dihydroquercetin 7-O-β-D-glucoside, 7-O-methyl-(2R:3R)-dihydrokaempferol 5-O-β-D-glucopyranoside, 7-O-methyl-(2R:3R)-dihydroquercetin 5-O-β-D-glucopyranoside, 7-O-methylkaempferol 5-O-β-D-glucopyranoside and 7-O-methylquercetin 5-O-β-D-glucopyranoside.Diagnostically useful physical techniques for distinguishing substitution patterns in dihydroflavonols are discussed and summarized.Glucosylation of the 5-hydroxyl group in (+)-dihydroflavonols is shown to reverse the sign of rotation at 589 nm.Key Word Index- Podocarpus nivalis; Podocarpaceae; snow totara; gymnosperm; flavonoid glycosides; 7-O-methyl-(2R:3R)-dihydroquercetin 5-O-β-D-glucoside; 7-O-methylquercetin 5-O-β-D-glucoside; luteolin 3'-O-β-D-xyloside; luteolin 7-O-β-D-glucoside-3'-O-β-D-xyloside; FAB-MS; 13C NMR.
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