Methyl vinyl ketone reacts with 1-pyrrolidin-1-ylisobutene to give the tricyclic diketone (2; R = Me). The reaction proceeds through the bisenamine (4; R = Me) formed by self-condensation of the intermediate dienamine (3).
J. W. Lewis and P. L. Myers, J. Chem. Soc. C, 1971, 753 DOI: 10.1039/J39710000753
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