The first total synthesis of the title compound has been accomplished using an intramolecular Diels–Alder reaction of a masked o-benzoquinone, anionic [1,3]-rearrangement of a vinylbicyclo[2.2.2]octenol and intramolecular hetero-Michael addition of a hydroxy enone as the key steps.
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Liu et al. (1999) studied this question.