Imino Diels–Alder reaction of 2-t-butyldimethylsilyloxycyclohexadiene: isolation of an azabicyclo[2.2.2]octene silyl enol ether adduct

Abstract
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).

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