[Cl:1][C:2]1[CH:3]=[CH:4][C:5]([O:33][C:34]([CH2:44][CH3:45])([CH2:42][CH3:43])[C:35]([NH:37][S:38]([CH3:41])(=[O:40])=[O:39])=[O:36])=[C:6]([CH:8]2[CH2:13][C:12](=[O:14])[NH:11][CH:10]([C:15]3[CH:20]=[C:19]([F:21])[CH:18]=[CH:17][C:16]=3[CH3:22])[C:9]32[C:30]2[C:25](=[CH:26][C:27]([Cl:31])=[CH:28][CH:29]=2)[NH:24][C:23]3=[O:32])[CH:7]=1.[C:46](OC(=O)C)(=[O:48])[CH3:47]>C(Cl)Cl.CN(C1C=CN=CC=1)C>[C:46]([N:24]1[C:25]2[C:30](=[CH:29][CH:28]=[C:27]([Cl:31])[CH:26]=2)[C:9]2([CH:8]([C:6]3[CH:7]=[C:2]([Cl:1])[CH:3]=[CH:4][C:5]=3[O:33][C:34]([CH2:44][CH3:45])([CH2:42][CH3:43])[C:35]([NH:37][S:38]([CH3:41])(=[O:40])=[O:39])=[O:36])[CH2:13][C:12](=[O:14])[NH:11][CH:10]2[C:15]2[CH:20]=[C:19]([F:21])[CH:18]=[CH:17][C:16]=2[CH3:22])[C:23]1=[O:32])(=[O:48])[CH3:47]At room temperature, to a mixture of racemic (2′S, 3S, 4′R)-4′-[5-chloro-2-(2-methanesulfonylamino-1,1-diethyl-2-oxo-ethoxy)-phenyl]-6-chloro-2′-(5-fluoro-2-methyl-phenyl)-spiro[3H-indole-3,3′-piperidine]-2,6′(1H)-dione (540 mg, 0.8 mmol) and acetic anhydride (98 mg, 0.96 mmol) in DCM (20 mL) was added DMAP (10 mg, 0.08 mmol) slowly. After the mixture was stirred for 2 h, the solution was washed by 0.5N HCl solution twice, dried over anhydrous Na2SO4 and concentrated. The residue was purified by flash column chromatography to give the title compound as a white solid (450 mg).
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