5,5-二甲基-3-(4-甲基苯胺基)环己-2-烯-1-酮 、
4,5-dimethoxycarbonyl-1-(4'-methoxyphenyl)-1H-pyrrole-2,3-dione 以
甲苯 为溶剂,
以79%的产率得到methyl 4'-hydroxy-6,6-dimethyl-1-(4-methylphenyl)-1'-(4-methoxyphenyl)-2,4,5'-trioxo-1,1',2,4,5,5',6,7-octahydrospiro[indole-3,2'-pyrrole]-3'-carboxylate