7-Oxo-7-deacetoxykhivorin has been transformed into the diene-lactone (XI), a postulated biogenetic precursor of the bicyclonanolide group of tetranortriterpenoids, which when treated with very mild base readily undergoes intramolecular Michael addition to give mexicanolide (XII).
J. D. Connolly, I. M. S. Thornton and D. A. H. Taylor, J. Chem. Soc. D, 1971, 17 DOI: 10.1039/C29710000017
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