The tricyclic enone (8), conveniently prepared from the diene (5)via the adduct (7), afforded the endo-and exo-alcohols (9) whose toluene-p-sulphonates (10) were readily converted into the tricyclic ketones (11) and (12), thus paving the way for a new total synthesis of racemic zizaene (1) and of racemic cedrene (2) respectively.
K. Pramod and G. S. R. S. Rao, J. Chem. Soc., Chem. Commun., 1982, 762 DOI: 10.1039/C39820000762
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