The reaction of the N-tosyl imino-ester (1) with 2-trimethylsilyloxycyclohexadiene (2) followed by acidic work-up shows a divergence in pathways: at low temperature in polar solvents the cyclohexenones (5) and (6)(X-ray) are favoured, whereas at higher temperatures the bicyclic ketones (3) and (4)(X-ray) are the predominant products.
T. N. Birkinshaw, A. B. Tabor, A. B. Holmes, P. Kaye, P. M. Mayne and P. R. Raithby, J. Chem. Soc., Chem. Commun., 1988, 1599 DOI: 10.1039/C39880001599
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