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Efficient palladium-catalyzed asymmetric allylic alkylation of ketones and aldehydes†
Xiaohu Zhao,Delong Liu,Fang Xie,Yangang Liu
Organic & Biomolecular Chemistry Pub Date : 12/15/2010 00:00:00 , DOI:10.1039/C0OB00915F
Abstract

Palladium-catalyzed asymmetric allylic alkylation of ketones, via enamines generated in situ as nucleophiles, were carried out smoothly with chiral metallocene-based P,N-ligands. Under the same conditions, however, reactions of aldehydes could hardly be observed. Subsequently, this obstacle was resolved by using chiral metallocene-based P,P-ligands. Both ketones and aldehydes afforded excellent enantioselectivities with up to 98% ee and 94% ee, respectively.

Graphical abstract: Efficient palladium-catalyzed asymmetric allylic alkylation of ketones and aldehydes
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