Rhenium-Catalyzed Activation of Olefinic C-H Bond: Synthesis of Cyclopentadienyl-Rhenium Complexes

摘要

One of the most important categories of transition metal complexes is cyclopentadienyl (Cp) complexes. Because the reactivity of Cp complexes can usually be controlled by changing the substituents of the Cp ring, many methods have been developed to introduce appropriate substituents at desired positions. We disclose here a novel method for [3+2] construction of substituted cyclopentadienes from α,β-unsaturated ketimines and α,β-unsaturated carbonyl compounds initiated by olefinic C-H activation of the ketimines. The C-H activation, which is the key step in the reaction, is accomplished with a rhenium catalyst.