[F:1][C:2]1[C:10]([F:11])=[CH:9][CH:8]=[C:7]2[C:3]=1[C:4]([CH3:14])([CH3:13])[C:5](=O)[NH:6]2.[H-].[Al+3].[Li+].[H-].[H-].[H-].O>C1COCC1>[F:1][C:2]1[C:10]([F:11])=[CH:9][CH:8]=[C:7]2[C:3]=1[C:4]([CH3:14])([CH3:13])[CH2:5][NH:6]20.15 mg (0.76 mmol) 4,5-difluoro-3,3-dimethyl-1,3-dihydro-indol-2-one were placed in 20 mL THF under argon. 0.91 mL (0.91 mmol) of a 1M lithium aluminium hydride solution in 10 mL THF were added dropwise. The reaction mixture was stirred for 1 h at 70° C., cooled and mixed with water. The reaction mixture was dried, filtered and concentrated to dryness by rotary evaporation.
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