methyl 2-(4-ethoxy-3-((4-fluorophenyl)amino)-4-oxobutan-2-ylidene)hydrazinecarboxylate   、                                                                                      
potassium thioacyanate                                                                                                                                                                                              以
                                                                                         
盐酸                                                                                  为溶剂,
                                                                                                                                                    反应 2.0h,
                                                                                                                以to afford ethyl 1-(4-fluorophenyl)-2-mercapto-4-methyl-1H-imidazole-5-carboxylate (57)的产率得到ethyl 1-(4-fluorophenyl)-2-mercapto-4-methyl-1H-imidazole-5-carboxylate