Palladium(II) chloride-catalysed cascade cyclisation–cycloaddition reactions of δ-alkenyl oximes occur regio- and facially-specifically in high yield via intermediate six-membered cyclic nitrones; preliminary studies of γ-alkenyl oximes show they are reluctant to cyclise; four potential synthetic variants of the cascade process are identified and examples of two of the classes are provided.
M. Frederickson, R. Grigg, J. Markandu and J. Redpath, J. Chem. Soc., Chem. Commun., 1994, 2225 DOI: 10.1039/C39940002225
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