Origin of the Relative Stereoselectivity of the β-Lactam Formation in the Staudinger Reaction
作者:Lei Jiao、Yong Liang、Jiaxi Xu
DOI:10.1021/ja056711k
日期:2006.5.1
stereoselectivity of the beta-lactam formation is one of the critical issues in the Staudinger reaction. Although many attempts have been made to explain and to predict the stereochemical outcomes, the origin of the stereoselectivity remains obscure. We are proposing a model that explains the relative stereoselectivity based on a kinetic analysis of the cis/trans ratios of reaction products. The results were
Notable and Obvious Ketene Substituent-Dependent Effect of Temperature on the Stereoselectivity in the Staudinger Reaction
作者:Bonan Li、Yikai Wang、Da-Ming Du、Jiaxi Xu
DOI:10.1021/jo0622734
日期:2007.2.1
C-substituents if they exist, and the isomerization of the zwitterionic intermediates generated from ketenes and imines during the change in the reaction temperature, not by the competition of the imine exo and endo attacks to the ketenes. Our results also indicate that nonlinear Eyring plots do not always reveal a change of the stereoselectivity-determining step. Thus, one should use them carefully to determine