The imino Diels–Alder reaction of (1) with 2-t-butyldimethylsilyloxycyclohexadiene (2) gave after acidic work-up mainly the bicyclic enol ethers (5a)(for which a novel X-ray crystal structure determination is reported) and (5b) together with small amounts of bicyclic ketones (3a,b) and cyclohexenones (4a,b).
T. N. Birkinshaw, A. B. Tabor, A. B. Holmes and P. R. Raithby, J. Chem. Soc., Chem. Commun., 1988, 1601 DOI: 10.1039/C39880001601
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