Electronic and Steric Control in Regioselective Addition Reactions of Organolithium Reagents with Enaldimines
作者:Kiyoshi Tomioka、Yoshito Shioya、Yasuo Nagaoka、Ken-ichi Yamada
DOI:10.1021/jo015766b
日期:2001.10.1
A reaction mode of imines derived from naphthalene-1-carbaldehyde and acyclic alpha,beta-unsaturated aldehydes with organolitium reagents was dependent on the characteristic nature of a substituent on the imine nitrogen atom. An imine having an electron-withdrawing aryl group on the nitrogen atom behaves as a 1,2-directing imine toward organolithium reagents. In contrast, an imine bearing an alkyl
衍生自萘-1-甲醛和无环α,β-不饱和醛的亚胺与有机锂试剂的反应方式取决于亚胺氮原子上取代基的特征。在氮原子上具有吸电子芳基的亚胺表现为朝向有机锂试剂的1,2-亚胺。相反,带有烷基或庞大的芳基的亚胺有利于有机锂试剂的1,4-加成。基于分子轨道计算,合理化了亚胺氮原子上取代基的电子和空间反应模式调节。