Chemical Constituents of Rhododendron lepidotum
Two new coumarin glycosides, 7-O-β-D-glucopyranosyl-8-methoxybenzopyranone (1) and 7-hydroxy-8-O-β-glycosylbenzopyranone ((2), are reported along with the isolation of 7,8-dihydroxy coumarin (daphnetin) from Rhododendron lepidotum (aerial part).
Dihydroflavonol glycosides from rhododendron ferrugineum
Abstract Chemical investigation of the leaves and the flowers of Rhododendron ferrugineum afforded six known flavonoids: hyperoside, myricetin 3-O-β-galactopyranoside, kaempferol 3-O-(6″-O-acetyl)-glucoside, quercetin 3-O-(6″-O-acetyl)-glucoside, quercetin 3-O-(6″-O-acetyl)-galactoside, quercetin 3-O-(3″,6″-O-diacetyl)-galactoside and two new dihydroflavonol glycosides: trans-taxifolin 3-O-α-arabinopyranoside and cis-taxifolin 3-O-α-arabinopyranoside.
Les flavonoïdes de Doronicum grandiflorum
Abstract After isolation and identification of the flavonoid compounds of D. grandiflorum Lam., a comparison of the flavonoid patterns of four species of Doronicum was undertaken. The differences observed are discussed from the evolutionary point of view.