Partial synthesis of mexicanolide from 7-oxo-7-deacetoxykhivorin
Abstract
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).