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。