1,3,3-trimethyl-6,7-dimethoxy-3,4-dihydroisoquinoline   、                                                                                      
4-benzoyl-5-methoxycarbonyl-1-p-tolyl-2,3-dihydro-2,3-pyrroledione                                                                                                                                                                                              以
                                                                                         
苯                                                                                  为溶剂,
                                                                                                                                                                                        以58%的产率得到5,5-dimethyl-8,9-dimethoxy-3-oxo-2,3,5,6-tetrahydropyrrolo[2,1-a]isoquinoline-2-spiro-2'-(4-hydroxy-3-benzoyl-5-oxo-1-(p-tolyl)-2,5-dihydro-1H-pyrrole)