(3S)-3-tert-butyl-1-[(2,3-difluorophenyl)methyl]-4-hydroxy-2-methyl-6-oxo-3H-pyridazine-5-carboxylic acid 2-methylpropyl ester   、                                                                                      
4-chloro-2-(6-(trifluoromethyl)pyrimidin-4-yl)aniline                                                                                                                                                                                              以
                                                                                         
甲苯                                                                                  为溶剂,
                                                                                                                                                    反应 1.0h,
                                                                                                                以85%的产率得到(3S)-3-tert-butyl-N-[4-chloro-2-[6-(trifluoromethyl)pyrimidin-4-yl]phenyl]-1-[(2,3-difluorophenyl)methyl]-4-hydroxy-2-methyl-6-oxo-3H-pyridazine-5-carboxamide