TWO DIBENZOYLMETHANES FROM THE FROND EXUDATE OF NOTHOLAENA SPECIES

Article abstract of DOI:10.1016/0031-9422(92)80053-H

Fronds of various ferns in the genus notholaena produce an exudate which consists mostly of flavonoid aglycones.In some species we found small amounts of two dibenzoylmethanes or β-diketones.These have been identified by spectroscopic methods.Both, 2',β,4-trihydroxy-4',6'-dimethoxychalcone and 2',β-dihydroxy-4',6',4-trimethoxychalcone, are novel natural products.The structures have been confirmed by synthesis of the latter compound. Key words: Notholaena; Pteridaceae; frond exudates; β-diketones; 2',β,4-trihydroxy-4',6'-dimethoxychalcone; 2',β-dihydroxy-4',6',4-trimethoxychalcone; 2',4'-dihydroxy-4',6'-dimethoxydibenzoylmethane, 2'-hydroxy-4',6',4-trimethoxydebenzoylmethane.