ethyl (Z)-3-(4-methoxyanilino)-2-butenoate   、                                                                                      
3-benzoylpyrrolo[2,1-c][1,4]benzoxazine-1,2,4-trione                                                                                                                                                                                              以
                                                                                         
苯                                                                                  为溶剂,
                                                                                                                                                                                        以93%的产率得到ethyl 3-benzoyl-4-hydroxy-1-(o-hydroxyphenyl)-5-oxo-2,5-dihydro-1H-pyrrole-2-spiro-3'-(5-methyl-1-(p-methoxyphenyl)-2-oxo-2,3-dihydro-1H-pyrrole-4-carboxylate)