[CH2:1]([N:8]1[C:16]2[C:11](=[CH:12][CH:13]=[C:14]([CH:17]=O)[CH:15]=2)[C:10]([C:19]([NH:21][CH2:22][C:23]2[CH:28]=[CH:27][C:26]([F:29])=[C:25]([F:30])[CH:24]=2)=[O:20])=[C:9]1[CH:31]([CH3:33])[CH3:32])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[CH2:34]([NH2:37])[CH2:35][NH2:36].C1C(=O)N(Br)C(=O)C1>C(Cl)Cl>[CH2:1]([N:8]1[C:16]2[C:11](=[CH:12][CH:13]=[C:14]([C:17]3[NH:36][CH2:35][CH2:34][N:37]=3)[CH:15]=2)[C:10]([C:19]([NH:21][CH2:22][C:23]2[CH:28]=[CH:27][C:26]([F:29])=[C:25]([F:30])[CH:24]=2)=[O:20])=[C:9]1[CH:31]([CH3:32])[CH3:33])[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1To a solution of 1-benzyl-N-(3,4-difluorobenzyl)-6-formyl-2-isopropyl-1H-indole-3-carboxamide (Compound 53, 18 mg, 0.040 mmol) in CH2Cl2 (1 ml) at 0° C. under argon was added ethylene diamine (2.5 mg, 0.042 mmol). The mixture was stirred at 0° C. for 30 minutes, and then added NBS (8 mg, 0.042 mmol). The reaction was stirred at 25° C. for 12 h, quenched with NaHCO3 (aqueous), diluted with EtOAc, washed with H2O, brine, dried over Na2SO4, concentrated in vacuo. The residue was purified by chromatography on silica gel (100% EtOAc) to yield the title compound as a light yellow solid.
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