名称:
                                A concise stereoselective approach to β-Alkylaspartates from β-Lactams via [2 + 2] cycloaddition reaction of ketenes to glyoxylic ester-derived imines.
                             
                            
                                摘要:
                                syn beta-Alkyl aspartates were obtained with high stereoselectivities from cis 4-alkoxycarbonyl-beta-lactams prepared via [2 + 2] cycloaddition reaction of monoalkylketenes and glyoxalate derived imines.
                             
                                                            
                                    DOI:
                                    10.1016/s0040-4039(00)61295-9