Abstract
Investigation of the root bark extract of Entandrophragma angolense led to identification of two gedunin-type limonoids 5-hydroxy-7-deacetoxy-7-oxogedunin ( 1) and 5,6-dehydro-7-deacetoxy-7-oxogedunin ( 2), and three methyl angolensate derivatives, 6-deacetoxydomesticulide D ( 3), 6-deacetoxydomesticulide D 21-methylether ( 4), and entangosin ( 5), together with known compounds, methyl angolensate ( 6), 6-acetoxymethyl angolensate ( 7) and secomahoganin ( 8). Their structures were established by extensive NMR experiments in conjunction with mass spectrometry. Entangosin is a rare example of a limonoid derivative having a fully O-substituted furan moiety.
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