The simple meliacin (IIa)(7α-acetoxymeliaca-14,20,22-trien-3-one) has been converted into azadirone (IIb) by treatment with copper(II) bromide followed by dehydrobromination; khayanthone (IV) has been converted into khivorin (V) by oxidation with alkaline hydrogen peroxide followed by re-acetylation.
J. G. St. C. Buchanan and T. G. Halsall, J. Chem. Soc. D, 1969, 1493 DOI: 10.1039/C29690001493
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