[F:1][C:2]1[CH:3]=[C:4]2[C:9](=[CH:10][C:11]=1[F:12])[N:8]1[CH:13]=[CH:14][N:15]=[C:7]1[C:6](=O)[NH:5]2.C[Si](C)(C)N[Si](C)(C)C.S([O-])([O-])(=O)=O.[NH4+].[NH4+].[NH2:33][CH2:34][CH2:35][CH2:36][OH:37]>C(OCC)(=O)C.O>[F:1][C:2]1[CH:3]=[C:4]2[C:9](=[CH:10][C:11]=1[F:12])[N:8]1[CH:13]=[CH:14][N:15]=[C:7]1[C:6]([NH:33][CH2:34][CH2:35][CH2:36][OH:37])=[N:5]2A mixture of 7,8-difluoroimidazo[1,2-a]quinoxalin-4(5H)-one (Eur. J. Med. Chem. 1998, 33, 943) (20 mg, 0.090 mmol), hexamethyldisilazane (66 μL, 0.31 mmol), ammonium sulphate (2.4 mg, 0.018 mmol) and 3-aminopropan-1-ol (34 μL, 0.45 mmol) was stirred under argon at 120° C. overnight. The reaction mixture was allowed to cool down to room temperature and the white residue was diluted in ethyl acetate and water. A white precipitate was filtered off and the filtrate was washed with brine. The organic phase was dried over sodium sulfate, filtered and evaporated. The crude product was purified by preparative TLC (silica gel, dichloromethane/methanol 90/10) to afford the title compound as white crystals (4.5 mg, 18%)
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