ethyl 2-(2,6,6-trimethyl-3-(2-(4-methylphenylsulfonamido)benzyl)-4-oxo-4,5,6,7-tetrahydro-1H-indol-1-yl)acetate 以
2-(3-(2-(N,4-dimethylphenylsulfonamido)benzyl)-2,6,6-trimethyl-4-oxo-4,5,6,7-tetrahydro-1H-indol-1-yl)acetic acid 为溶剂,
以to afford 2-(2,6,6-trimethyl-3-(2-(4-methylphenylsulfonamido)benzyl)-4-oxo-4,5,6,7-tetrahydro-1H-indol-1-yl)acetic acid as a clean product的产率得到2-(2,6,6-trimethyl-3-(2-(4-methylphenylsulfonamido)benzyl)-4-oxo-4,5,6,7-tetrahydro-1H-indol-1-yl)acetic acid