作者:Zi-Qiang Gu、David P. Hesson                                    
                                    
                                        DOI:10.1016/0957-4166(95)00274-s
                                    
                                    
                                        日期:1995.9
                                    
                                    Treatment of N-p-nitrobenzoyl L- or D-glutamic acid diester with lithium bis(trimethylsilyl)amide generates a chelated gamma-enolate which reacts with alkyl halides to give (2S,4S)- or (2R,4R)-4-alkylated glutamic acid derivatives with very high diastereoselectivity.