A Novel Type of Flavonoids: Flavonol Esters from Fern Exudates
1978; De Gruyter; Volume: 33; Issue: 11-12 Linguagem: Inglês
10.1515/znc-1978-11-1205
ISSN1865-7125
AutoresEckhard Wollenweber, Jean Favre-Bonvin, Melanie Jay,
Tópico(s)Natural product bioactivities and synthesis
ResumoMannose exudates on fronds of Notholaena species are known to consist of navonoid aglycones. These are predominantly methylated flavones and flavonols, sometimes chalcones and dihydrochal-cones. Flavonols with unusual properties, excreted as major farina components by some species, have been found to be derivatives of methylated flavonols, esterified in position 8 with butyric or acetic acids, respectively. These are a novel type of flavonoids. They occur as twin-pairs, some with very great differences in proportions. Their presence in a group of species within the genus has chemotaxonomic implications. Two of the flavonols resulting from hydrolysis are new compounds.
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