Minor secondary metabolites from the bark of Entandrophragma congoënse (Meliaceae)
Gervais Mouthé Happi1, Simeon Fogue Kouam2, Ferdinand Mouafo Talontsi3
1Department of Chemistry, Higher Teachers' Training College, University of Yaounde I, P. O. Box 47, Yaounde, Cameroon; Institute of Environmental Research (INFU) of the Faculty of Chemistry and Chemical Biology, Chair of Environmental Chemistry and Analytical Chemistry, TU Dortmund, Otto-Hahn-Str. 6, D-44221 Dortmund, Germany.
Abstract:
Two new tirucallane-type triterpenoids were isolated from the bark of Entandrophragma congoënse (Meliaceae) along with five known compounds gladoral A, bipendensin, 4-hydroxymethyl-3,5-dimethyldihydrofuran-2(3H)-one, scopoletin and 5,7-dimethoxy-6-hydroxycoumarin. Their structures were elucidated by means of spectroscopic analyses including 1D and 2D-NMR spectroscopy, high resolution mass spectrometric data as well as the comparison of data with those reported in the literature. The tested compounds (1-4) displayed moderated antiplasmodial activity against erythrocytic stages of chloroquine-resistant Plasmodium falciparum strain NF54 and low cytotoxicity on L6 cell lines. All the isolated compounds are reported for the first time from the genus Entandrophragma.
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