Flavonol 3-O-Glycosides from Three Algerian Bupleurum Species

Flavonoids distribution in three algerian Bupleureum (Apiaceae) species has been investigated. Quercetin (1), quercetin 3-rutinoside (2) and isorhamnetin 3-rutinoside (3) were found in the endemic species B. plantagineum Desf. Three kaempferol glycosides, kaempferol 3-glucoside (4), kaempferol 3-galactoside (5), kaempferol 3-rutinoside (6) and three quercetin glycosides, quercetin 3-rutinoside (2), quercetin 3-glucoside (7) and quercetin 3-galactoside (8), have been isolated from B. fruticosum L. while isorhamnetin (9), isorhamnetin 3-galactoside (10) and isorhamnetin 3-galactorhamnoside (11) were found in B. spinosum L. Seven flavonols are reported here for the first time from the genus.