5,5-dimethyl-3-(N-naphthylamino)-cyclohex-2-enone   、                                                                                      
4,5-dimethoxycarbonyl-1-(4'-methoxyphenyl)-1H-pyrrole-2,3-dione                                                                                                                                                                                              以
                                                                                         
甲苯                                                                                  为溶剂,
                                                                                                                                                                                        以72%的产率得到methyl 4'-hydroxy-6,6-dimethyl-1-(naphth-1-yl)-1'-(4-methoxyphenyl)-2,4,5'-trioxo-1,1',2,4,5,5',6,7-octahydrospiro[indole-3,2'-pyrrole]-3'-carboxylate