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[4+1]/[2+1] Cycloaddition reactions of fischer carbene complexes with α,β-unsaturated ketones and aldehydes
Barluenga, Jose,Fanlo, Hugo,Lopez, Salome,Florez, Josefa
, p. 4136 - 4140 (2007)
(Chemical Equation Presented) Put two and two together: Fischer carbene complexes and α,β-unsaturated carbonyl compounds smoothly react under thermal conditions to give 2,3-dihydrofurans, and from them furans or 1,4-dicarbonyl compounds were easily accessible (see scheme). This cycloaddition process involves a cyclopropanation reaction followed by rearrangement from the acylcyclopropane to a dihydrofuran.
