Prenylated flavonoids from the aerial parts of Dorstenia mannii
2000
Ngadjui, B.T. | Kouam, S.F. | Dongo, E. | Kapche, G.W.F. | Abegaz, B.M.
Four new prenylated flavanones, dorsmanins I, 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'- trihydroxyflavanone, 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.
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