FC(F)(F)C([N:5]1[C:13]2[C:8](=[CH:9][C:10]([C:14]#[N:15])=[CH:11][CH:12]=2)[CH2:7][CH2:6]1)=O>C1COCC1.[OH-].[Na+]>[NH:5]1[C:13]2[C:8](=[CH:9][C:10]([C:14]#[N:15])=[CH:11][CH:12]=2)[CH2:7][CH2:6]11-(2,2,2-Trifluoroacetyl)-2,3-dihydro-1H-indole-5-carbonitrile (13 g, 0.0542 mol; see step (iii) above) was dissolved in THF (100 mL), to which 1% NaOH was then added. After stirring for 5 h at RT, the reaction mixture was extracted with ethyl acetate. The organic layer was washed with water and brine, dried over sodium sulfate and solvent was evaporated to provide the sub-title compound as a pale yellow solid. Yield: 8 g.
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