Chiral Bicyclic Lactams. A New Study on Facial Alkylation
作者:A. I. Meyers、M. A. Seefeld、B. A. Lefker
DOI:10.1021/jo960952g
日期:1996.1.1
Stereoselective Alkylations in Rigid Systems. Effect of Remote Substituents on π-Facial Additions to Lactam Enolates. Stereoelectronic and Steric Effects
作者:A. I. Meyers、Mark A. Seefeld、Bruce A. Lefker、James F. Blake、Paul G. Williard
DOI:10.1021/ja980614s
日期:1998.8.1
of the alkylation of their enolates shows a high degree of endo or exo entry, depending upon certain substituents and their positions in the lactams. The suggested reasons for the exo or endo selectivity for alkylation were determined to be purely electronic or purely steric in certain instances. The results of the selectivity study now allow the asymmetric synthesis of various ketones, acids, and pyrrolidines