Alpha-substitution of unprotected beta-amino ester compounds

摘要

Methods for stereoselective substitution in which a (mono or un)-alpha-substituted unprotected beta-amino ester compound or salt thereof is reacted with an aliphatic electrophile in the presence of a base selected from alkyl lithium compounds, lithium hydride, lithium amide, lithium dialkyl amides and alkali hexamethyldisilylamines.