title: Prenylated flavonoids from the aerial parts of Dorstenia mannii.
abstract: Four new prenylated flavanones, dorsmanins 1, J and epi-dorsmanins F, G, identified, respectively, as 6,7-(2,2-dimethylpyrano)-8-prenyl-5,3',4'-trihydroxyflavanone, 6,7-(2,2-dimethyldihydropyrano)-8-prenyl-5,3',4'-trihydroxflavanone, and 2''-epimers of dorsmanins F and G were isolated from the aerial parts of Dorstenia mannii together with 13 known flavonoids: 4-hydroxylonchocarpin, 4-methoxylonchocarpin, 6-prenylchrysoeriol, 6,8-diprenyleriodictyol, gancaonin P and dorsmanins A-H. The structures of these secondary metabolites were determined by spectroscopic means and by comparison with published data and with authentic specimens for some of the known compounds.
authors.affiliation: Department of Organic Chemistry, University of Yaounde, Cameroon.
authors.forename: B T
authors.initials: BT
authors.lastname: Ngadjui
authors.forename: S F
authors.initials: SF
authors.lastname: Kouam
authors.forename: E
authors.initials: E
authors.lastname: Dongo
authors.forename: G W
authors.initials: GW
authors.lastname: Kapche
authors.forename: B M
authors.initials: BM
authors.lastname: Abegaz
mesh_terms: D005419:Flavonoids / Q000737:chemistry / Q000302:isolation & purification*; D009682:Magnetic Resonance Spectroscopy; D008968:Molecular Conformation; D017368:Protein Prenylation; D019685:Rosales / Q000737:chemistry*
chemical_list: D005419:Flavonoids