Catalysis of Mukaiyama Aldol Reactions by a Tricyclic Aluminum Alkoxide Lewis Acid
作者:Steven M. Raders、John G. Verkade
DOI:10.1021/jo9009134
日期:2009.8.7
The Mukayiama aldol reaction of aldehydes is efficiently accomplished with a low concentration of the dimeric alumatrane catalyst 2 at mild or subambient temperatures. Our protocol tolerates a wide variety of electron-rich, neutral, and deficient aryl, alkyl, and heterocyclic aldehydes. A wide variety of enol silyl ethers are also tolerated. An intermediate that was isolated provides mechanistic information
在温和或低于室温的温度下,用低浓度的二聚体金刚烷催化剂2有效地完成了醛的Mukayiama醛醇缩醛反应。我们的协议可以耐受多种富电子,中性和不足的芳基,烷基和杂环醛。也可以耐受各种各样的烯醇甲硅烷基醚。分离出的中间体提供了有关二聚体2在Mukaiyama aldol反应中的作用的机械信息。实验证据表明,与F 3 B相比,路易斯酸的5酸更强。