Cyclobutane sesquiterpenes (±)-italicene 1 and (±)-isoitalicene 2 have been synthesised from the benzocyclobutene derivative 20 employing an intramolecular γ-alkylation of the β,γ-unsaturated ketone 25 as a key reaction.
T. Honda, K. Ueda, M. Tsubuki, T. Toya and A. Kurozumi, J. Chem. Soc., Perkin Trans. 1, 1991, 1749 DOI: 10.1039/P19910001749
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