4-nitrophenyl (1S)-1-cyclopropyl-2-[(2S)-4-(2,5-difluorophenyl)-2-phenyl-2,5-dihydro-1H-pyrrol-1-yl]-2-oxoethylcarbamate   、                                                                                      
N,N-二甲基乙醇胺                                                                                                                                                              在
                                                                                                                                                                                 
乙酸乙酯   、                                                                                                  Brine   、                                                                                                  
magnesium sulfate                                                                                                                                  作用下,
                                                                                                                                                                                        反应 1.0h,
                                                                                                                以to give 2-(dimethylamino)ethyl(1S)-1-cyclopropyl-2-[(2S)-4-(2,5-difluorophenyl)-2-phenyl-2,5-dihydro-1H-pyrrol-1-yl]-2-oxoethylcarbamate (31-2) as a pale yellow solid的产率得到2-(dimethylamino)ethyl (1S)-1-cyclopropyl-2-[(2s)-4-(2,5-difluorophenyl)-2-phenyl-2,5-dihydro-1h-pyrrol-1-yl]-2-oxoethylcarbamate