Highly stereodivergent generation of the Z- and E-enolates of a β-amino ester via conjugate addition to methyl crotonate by using lithium N-benzyltrimethylsilylamide as a nitrogen nucleophile, and application to stereoselective aldol reactions

Abstract

Methods for highly stereoselective generation of both Z- and E-enolates of a β-amino ester have been developed on the basis of a conjugate addition of lithium N-benzyltrimethylsilylamide to methyl crotonate and applied to stereoselective synthesis of anti,syn- and syn,anti-β-amino-β′-hydroxy esters by treatment with aldehyde.