[NH2:1][C:2]1[CH:10]=[C:9]2[C:5]([C:6](=CC3NC4CCN(CCN(CC)CC)C(=O)C=4C=3C)[C:7](=[O:11])[NH:8]2)=[CH:4][C:3]=1[F:31].[C:32](Cl)(=[O:34])[CH3:33]>O1CCCC1>[F:31][C:3]1[CH:4]=[C:5]2[C:9](=[CH:10][C:2]=1[NH:1][C:32](=[O:34])[CH3:33])[NH:8][C:7](=[O:11])[CH2:6]2A stirred solution of 6-amino-5-fluoro-1,3-dihydro-indol-2-one (1.0 g, 6 mmol) obtained from Example 7 in 30 ml of tetrahydrofuran was added with tirethylamine (1.3 ml, 9 mmol). The solution was cooled down to 0° C. in an ice-water bath and added with acetyl chloride (1.3 ml, 9 mmol) dropwise. Upon the completion of the addition, the resulting mixture was heated to reflux for 1.5 hours and cooled until precipitate was formed. The solid was filtered, washed with water (50 ml×3) and dried in vacuo to give N-(5-fluoro-2-oxo-2,3-dihydro-1H-indol-6-yl)-acetamide (1.25 g, 99%) as a white solid.
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