Unusual Tethering Effects in the Schmidt Reaction of Hydroxyalkyl Azides with Ketones: Cation−π and Steric Stabilization of a Pseudoaxial Phenyl Group
作者:Christopher E. Katz、Jeffrey Aubé
DOI:10.1021/ja0382361
日期:2003.11.1
The Lewis acid-promoted reactions of chiral 2-aryl-3-azido-1-propanols with 4-substituted cyclohexanones lead to iminium ethers and ultimately caprolactams (following a hydrolysis step). In this study, it is shown that these reactions afford variable ratios of products, depending on the electronic nature of the phenyl group. These results are interpreted in the context of a cation-pi stabilizing effect
路易斯酸促进的手性 2-芳基-3-叠氮基-1-丙醇与 4-取代环己酮的反应生成亚胺醚并最终生成己内酰胺(在水解步骤之后)。在这项研究中,表明这些反应提供了可变比例的产物,这取决于苯基的电子性质。这些结果在决定产物的反应中间体中阳离子-π 稳定作用的背景下进行解释。值得注意的是,当使用含有季铵盐中心的叠氮基丙醇试剂时,选择性最佳;对照实验表明,在该结果中观察到的高选择性取决于提供主要产物的中间体中假轴芳基的自由旋转。