Chiral Lewis Acid-Catalyzed Enantioselective Intramolecular Carbonyl Ene Reactions of Unsaturated α-Keto Esters
作者:Dan Yang、Min Yang、Nian-Yong Zhu
DOI:10.1021/ol035486d
日期:2003.10.1
[reaction: see text] Chiral Lewis acid-promoted highly enantioselective intramolecular carbonyl enereactions of unsaturated alpha-keto esters have been investigated. In the presence of chiral Lewis acids such as [Sc((R,R)-Ph-pybox)](OTf)(3) and [Cu((S,S)-Ph-box)](OTf)(2), several unsaturated alpha-keto esters underwent carbonyl enereactions in CH(2)Cl(2) at room temperature to give monocyclic products