3-Allylamino-5,5-dimethyl-2-cyclohexen-1-on 、
4,5-dimethoxycarbonyl-1-(4'-methylphenyl)-1H-pyrrole-2,3-dione 以
甲苯 为溶剂,
以77%的产率得到methyl 1-allyl-4'-hydroxy-6,6-dimethyl-1'-(4-methylphenyl)-2,4,5'-trioxo-1,1',2,4,5,5',6,7-octahydrospiro[indole-3,2'-pyrrole]-3'-carboxylate