methyl 6-(3,3-diethoxyprop-1-ynyl)-5-methyl-3-oxo-4-(3-(trifluoromethyl)phenyl)-3,4-dihydropyrazine-2-carboxylate   、                                                                                      
4-氰基苯肼盐酸盐   、                                                                                      
水                                                                                                                                                              在
                                                                                                                                                                                 
水                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
甲醇                                                                                  为溶剂,
                                                                                                                                                    反应 1.5h,
                                                                                                                以to give methyl 6-(3-(2-(4-cyanophenyl)hydrazono)prop-1-ynyl)-5-methyl-3-oxo-4-(3-(trifluoromethyl)phenyl)-3,4-dihydropyrazine-2-carboxylate (1.18 g, 95%) as a yellow solid的产率得到methyl 6-(3-(2-(4-cyanophenyl)hydrazono)prop-1-ynyl)-5-methyl-3-oxo-4-(3-(trifluoromethyl)phenyl)-3,4-dihydropyrazine-2-carboxylate