[CH3:1][C:2]([CH3:25])([CH3:24])[C:3]([N:5]1[C:13]2[C:8](=[CH:9][C:10]([C:14]([O:16]CC3C=CC=CC=3)=[O:15])=[CH:11][CH:12]=2)[CH:7]=[CH:6]1)=[O:4].[H][H]>C(O)C.[Pd]>[CH3:1][C:2]([CH3:25])([CH3:24])[C:3]([N:5]1[C:13]2[C:8](=[CH:9][C:10]([C:14]([OH:16])=[O:15])=[CH:11][CH:12]=2)[CH:7]=[CH:6]1)=[O:4]The benzyl 1-(2,2-dimethylpropionyl)-1H-indole-5-carboxylate (220 mg) obtained above was dissolved in ethanol, and 5% palladium on carbon (44 mg) was added thereto and stirred overnight at room temperature in a hydrogen atmosphere. Insoluble matter was removed by filtration, and the filtrate was concentrated under reduced pressure to give the title compound (140 mg, Y.:86%).
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