Asymmetric synthesis of diethyl α-amino- α-alkyl-phosphonates by alkylation of chiral phosphonoglycine equivalents: Role of chelating effects
                                
                                    
                                        作者:Giancarlo Jommi、Giuliana Miglierini、Roberto Pagliarin、Guido Sello、Massimo Sisti                                    
                                    
                                        DOI:10.1016/s0957-4166(00)82094-7
                                    
                                    
                                        日期:1992.9
                                    
                                    Diethyl alpha-amino-alpha-alkyl-phosphonates are obtained in good to high enantiomeric excesses by alkylation of chiral phosphonoglycine equivalents embodying the camphor skeleton. The chelating effects in the alkylation step play an important role in enhancing the diastereoselectivity of the reaction as substantiated by semiempirical calculations (AM1).