[NH2:1][C:2]1[CH:3]=[CH:4][C:5]2[C:6](=[O:15])[C:7]3[C:12]([C:13]=2[CH:14]=1)=[CH:11][CH:10]=[CH:9][CH:8]=3.C(N(CC)CC)C.[Cl:23][CH2:24][C:25](Cl)=[O:26]>ClCCl>[Cl:23][CH2:24][C:25]([NH:1][C:2]1[CH:3]=[CH:4][C:5]2[C:6](=[O:15])[C:7]3[C:12]([C:13]=2[CH:14]=1)=[CH:11][CH:10]=[CH:9][CH:8]=3)=[O:26]A solution of 3-amino-9-fluorenone (1.95 g, 10 mmols), triethylamine (2.07 ml, 15 mmols), in 25 ml of dried dichloromethane, is cooled to 10° C. and a solution of chloroacetyl chloride (1.18 g, 10.5 mmoles) in 10 ml of dried dichloromethane is then added drop by drop. The resulting mixture is kept stirring for 1 hour at room temperature overnight. The mixture is washed with 2×30 ml of water, dried over sodium sulfate and evaporated. 2.63 g 2-Chloro-N-(9-oxo-9H-fluoren-3-yl)-acetamide (97%) are obtained.
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