Two Novel Natural Flavonoids from Primula palinuri

Two New Prenylated Flavonoids From Paracalyx Scariosa

Two new prenylated flavonoids, named scariosin (1) and isorhynchospermin (2) were isolated from the leaves of paracalyx scariosa together with kaempferol, quercetin, kaempferol 3-O- rutinoside and rutin. The structures of (1) and (2) were characterized as 8-C- prenyl- taxifolin 7,3'-dimethylether and 6-C-prenylquercetin 7,4'-dimethylether by their chemical and spectra data, respectively.

Plant polyphenols. 3. Flavonoids in genotypes of Primula sinensis.

Novel Compounds from the Farinose Exudate of Primula

In botany textbooks the farinose coating on leaves and inflorescences of many Primula species is still often said to "consist of flavone". We have shown earlier [1, 2] that it is in fact formed by varying amounts of unsubstituted flavone (at least 50%), 5-hydroxy flavone and 2'-hydroxy flavone, accompanied in many species by 5,8-dihydroxy flavone (primetin) and 5,2'-dihydroxyflavone. Further co...

two new prenylated flavonoids from paracalyx scariosa

two new prenylated flavonoids, named scariosin (1) and isorhynchospermin (2) were isolated from the leaves of paracalyx scariosa together with kaempferol, quercetin, kaempferol 3-o- rutinoside and rutin. the structures of (1) and (2) were characterized as 8-c- prenyl- taxifolin 7,3'-dimethylether and 6-c-prenylquercetin 7,4'-dimethylether by their chemical and spectra data, respectively.

Novel Flavonoids from the Fern Notholaena sulphurea

T he m ajo r constituent of the yellow frond exudate of the fern Notholaena sulphurea was iden tified by spectroscopic m ethods as 3 ,5 ,2 '-trihydroxy-7-m ethoxy-8-acetoxy flavone and its struc tu re was confirm ed by synthesis. This novel natural flavonoid was also de tected in the frond exudate of five o ther Notholaena species. In the yellow form of N. sulphurea, the rare 5 ,2 'dihydroxy-7,...