[4+ 1]/[2+ 1] Cycloaddition Reactions of Fischer Carbene Complexes with α, β??Unsaturated Ketones and Aldehydes
J Barluenga, H Fanlo, S Lopez…
Index: Barluenga, Jose; Fanlo, Hugo; Lopez, Salome; Florez, Josefa Angewandte Chemie - International Edition, 2007 , vol. 46, # 22 p. 4136 - 4140
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Citation Number: 24
Abstract
The cyclopropanation reaction of electron-deficient olefins with Group 6 Fischer carbene complexes is a rather general and well-established process [1] that was first reported in 1970.[2] Alkoxycarbene complexes are able to transfer their carbene ligand to the C= C bond of alkenes, which are substituted by various electron-withdrawing groups (EWG).[3] α, β-Unsaturated esters, amides, or nitriles,[4] alkenyl phosphonates,[4a, c–e, g, i] alkenyl ...
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