ethyl 5-methyl-3-oxo-1,2-dihydropyrrole-4-carboxylate   、                                                                                      
2,5-dimethyl-1-[4-(trifluoromethylsulfonyl)phenyl]-1H-pyrrole-3-carbaldehyde                                                                                                                                                              在
                                                                                                                                                                                 
potassium hydrogensulfate                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
乙醇                                                                                  为溶剂,
                                                                                                                                                    反应 3.0h,
                                                                                                                以93%的产率得到ethyl (5E)-5-[[2,5-dimethyl-1-[4-(trifluoromethylsulfonyl)phenyl]pyrrol-3-yl]methylidene]-2-methyl-4-oxo-1H-pyrrole-3-carboxylate