Ti-Catalyzed Reformatsky-Type Coupling between α-Halo Ketones and Aldehydes
作者:Rosa E. Estévez、Miguel Paradas、Alba Millán、Tania Jiménez、Rafael Robles、Juan M. Cuerva、J. Enrique Oltra
DOI:10.1021/jo702189k
日期:2008.2.1
We describe the first Ti-catalyzed Reformatsky-type coupling between α-halo ketones and aldehydes. The reaction affords β-hydroxy ketones under mild, neutral conditions compatible with ketones and other electrophiles. The catalytic cycle possibly proceeds via bis(cyclopentadienyl)titanium enolates.
Decarboxylative Aldol Reactions of Allyl β-Keto Esters via Heterobimetallic Catalysis
作者:Sha Lou、John A. Westbrook、Scott E. Schaus
DOI:10.1021/ja045981k
日期:2004.9.1
Mild and selective heterobimetallic-catalyzed decarboxylative aldol reactions involving allyl beta-keto esters have been developed. The reaction is promoted by Pd(0)- and Yb(III)-DIOP complexes at room temperature and involves the in situ formation of a ketoneenolate from allyl beta-keto esters followed by addition of the enolate to aldehydes. The reaction is a new example of heterobimetallic catalysis