Overriding Felkin Control: A General Method for Highly Diastereoselective Chelation-Controlled Additions to α-Silyloxy Aldehydes
作者:Gretchen R. Stanton、Corinne N. Johnson、Patrick J. Walsh
DOI:10.1021/ja910717p
日期:2010.3.31
Cram-chelation models, nucleophilic additions to alpha-silyloxy aldehydes proceed through a nonchelation pathway due to the steric and electronic properties of the silyl group, giving rise to Felkin addition products. Herein we describe a general method to promote chelation-control in additions to alpha-silyloxy aldehydes. Dialkylzincs, functionalized dialkylzincs, and (E)-disubstituted, (E)-trisubstituted