Electrostatic Repulsion and Hydrogen-Bonding Interactions in a Simple<i>N</i>-Aryl-<scp>L</scp>-valinamide Organocatalyst Control the Stereoselectivity in Asymmetric Aldol Reactions
作者:Yuya Tanimura、Kenji Yasunaga、Kaori Ishimaru
DOI:10.1002/ejoc.201301138
日期:2013.10
A novel stereocontrol method for asymmetric aldol reactions of aldehydes with ketones is described. The stereoselectivity of the products is controlled by the electrostatic repulsion and hydrogen-bonding interactions of an N-aryl-L-valinamide catalyst. The use of this catalyst in a cross-aldol reaction allows easy access to bioactive 3-cyclohexanone-3-hydroxy-2-oxindole with excellent diastereo- (syn/anti
描述了一种用于醛与酮的不对称羟醛反应的新型立体控制方法。产物的立体选择性受 N-芳基-L-缬氨酰胺催化剂的静电排斥和氢键相互作用控制。在交叉羟醛反应中使用该催化剂可以轻松获得具有优异非对映-(syn/anti = >99:1)和对映选择性(>99%ee)的生物活性 3-cyclohexone-3-hydroxy-2-oxindole。