3-[(4-甲氧苯基)氨基]-5,5-二甲基-1-环己-2-烯酮 、
4,5-dimethoxycarbonyl-1-(4'-methoxyphenyl)-1H-pyrrole-2,3-dione 以
甲苯 为溶剂,
以71%的产率得到methyl 4'-hydroxy-6,6-dimethyl-1,1'-bis(4-methoxyphenyl)-2,4,5'-trioxo-1,1',2,4,5,5',6,7-octahydrospiro[indole-3,2'-pyrrole]-3'-carboxylate