[NH2:1][C:2]1[CH:3]=[C:4]([F:12])[CH:5]=[C:6]2[C:10]=1[NH:9][C:8](=[O:11])[CH2:7]2.C(N(CC)CC)C.[C:20](Cl)(=[O:22])[CH3:21]>O1CCCC1>[F:12][C:4]1[CH:5]=[C:6]2[C:10](=[C:2]([NH:1][C:20](=[O:22])[CH3:21])[CH:3]=1)[NH:9][C:8](=[O:11])[CH2:7]2A stirred solution of 7-amino-5-fluoro-1,3-dihydro-indol-2-one (1.0 g, 6 mmol) obtained from Example 4 in 30 ml of tetrahydrofuran was added with triethylamine (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. 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-7-yl)-acetamide (1.2 g, 96%) as a white solid.
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