Prenylated anthranoids from Psorospermum species

The chemical composition of the root extracts of two Psorospermum sp. from the Ivory Coast is reported. Together with previously known compounds, acetylvismione F and 2-geranylemodin anthrone were isolated from P. corymbiferum, and vismione G from P. glaberrimum. Geranyl substitution is confirmed to be a typical feature of this genus.     

3-Geranyloxy-6-methyl-1,8-dihydroxyanthraquinone and vismiones C,D and E from Psorospermum febrifugum

Three new vismiones and 3-geranyloxy-6-methyl-1,8-dihydroxyanthraquinone were isolated from the berries of Psorospermum febrifugum together with the known chrysophanic acid, 2-isoprenylemodin and ferruginin B. Their structures were established through chemical and spectral means. The occurrence of prenylated anthracenes only in Vismieae suggests their use as systematic markers for the tribe.