Acid-catalysed rearrangement of cyclobutachromenol (7) followed by oxidation furnishes the tricyclic ketone (9) as the major product, which possesses the carbocyclic framework of aplysin (3).
D. Sengupta and R. V. Venkateswaran, J. Chem. Soc., Chem. Commun., 1986, 1638 DOI: 10.1039/C39860001638
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