Abstract
In addition to some previously described 7,8-dioxy-isoflavonoids and 2-benzylbenzo[ b]furan-3 (2H)-ones the heartwood of Xanthocercis zambesiaca has been shown to contain 7,8,3′-trihydroxy-4′-methoxyisoflavone. These are accompanied by the novel α,3,4,4′-tetrahydroxy-2′-methoxydihydrochalcone and its 3-deoxy analogue, the latter of which presumably served as biogenetic precursor for the unique 1-hydroxy-3-(4-hydroxyphenyl)-1-(4-hydroxy-2-methoxyphenyl) propan-2-one and its 1-deoxy analogue. Such possible biosynthetic relationship was demonstrated by the facile in vitro transformations of the appropriate α-hydroxydihydrochalcone into the different 1,3-diarylpropan-2-ones.
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