FC(F)(F)[C:3]([C:5]1[C:13]2[C:8](=[CH:9][C:10]([C:14]([F:17])([F:16])[F:15])=[CH:11][CH:12]=2)[N:7]([CH3:18])[CH:6]=1)=[O:4].[OH-:21].[Na+].Cl>>[CH3:18][N:7]1[C:8]2[C:13](=[CH:12][CH:11]=[C:10]([C:14]([F:17])([F:16])[F:15])[CH:9]=2)[C:5]([C:3]([OH:4])=[O:21])=[CH:6]1A mixture of 2,2,2-trifluoro-1-(1-methyl-6-(trifluoromethyl)-1H-indol-3-yl)ethanone (195 mg, 0.66 mmol) and 20% aqueous sodium hydroxide solution (5 mL) was refluxed with stirring for 10 hours. After cooling to room temperature, the mixture was poured into 1 M hydrochloric acid, and the aqueous phase was extracted with ethyl acetate (twice). The combined organic layers were dried over magnesium sulfate and concentrated in vacuo. The residual solid was washed with 2-propanol to give 107 mg (67% yield) of the title compound as a pale orange solid:
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