Cyclic β-ketoesters 1 undergo, in a one-pot process, an unprecedented DBU–MeOH promoted selective γ-arylidenation with aldehydes 2, by a directed γ-aldol reaction and dehydration sequence, to afford stereoselectively synthetically valuable cycloalkenones 3 in good yields.
M. Filippini and J. Rodriguez, J. Chem. Soc., Chem. Commun., 1995, 33 DOI: 10.1039/C39950000033
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