Asymmetric synthesis of (S)-ibuprofen by esterification with amides of (S)-lactic acid as chiral auxiliaries: experimental and theoretical results
                                
                                    
                                        作者:Alessandra Ammazzalorso、Rosa Amoroso、Giancarlo Bettoni、Barbara De Filippis、Letizia Giampietro、Marco Pierini、Maria Luisa Tricca                                    
                                    
                                        DOI:10.1016/s0040-4039(02)00792-x
                                    
                                    
                                        日期:2002.6
                                    
                                    A novel synthesis of chiral ibuprofen by a dynamic kinetic resolution process is described. The racemic ibuprofen was converted into the corresponding diastereomeric mixtures of esters with amides of (S)-lactic acid as chiral auxiliaries, using dicyclohexylcarbodiimide (DCC) and 4-dimethylaminopyridine (DMAP) as condensation agents. The reactions afforded predominantly one of the two diastereomers with good diastereomeric ratios. The reasons of the stereoselectivity were also investigated by molecular mechanic calculations, using MM2 force fields. (C) 2002 Elsevier Science Ltd. All rights reserved.