Divinylketone and the trimethylsily enol ethers of cyclohex-2-en-1-ones undergo Lewis acid assisted triple Michael reactions yielding tricyclo[5.3.1.03,8]undecan-4,11-diones; the application of this reaction enabled a formal synthesis of (±)-seychellene (5).
H. Hagiwara, A. Okano and H. Uda, J. Chem. Soc., Chem. Commun., 1985, 1047 DOI: 10.1039/C39850001047
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