2-[[4-Chloro-2-(trifluoromethyl)phenyl]methylidene]propanedinitrile   、                                                                                      
ethyl 3-(2,6-dichloro-5-fluoropyridin-3-yl)-3-oxopropanoate                                                                                                                                                              在
                                                                                                                                                                                 
哌啶                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
乙醇                                                                                  为溶剂,
                                                                                                                                                    反应 0.03h,
                                                                                                                以83%的产率得到ethyl 6-amino-4-(4-chloro-2-(trifluoromethyl)phenyl)-5-cyano-2-(2,6-dichloro-5-fluoropyridin-3-yl)-4H-pyran-3-carboxylate