[CH3:1][CH2:2][CH2:3][S:4]([NH:7][C:8]1[CH:9]=[CH:10][C:11]([F:33])=[C:12]([C:15]([C:17]2[C:21]3[CH:22]=[C:23]([C:26]4[CH:27]=[CH:28][C:29]([Cl:32])=[CH:30][CH:31]=4)[CH:24]=[N:25][C:20]=3[NH:19][CH:18]=2)=[O:16])[C:13]=1[F:14])(=[O:6])=[O:5].[ClH:34].C(O)C>CC(C)=O>[CH3:1][CH2:2][CH2:3][S:4]([NH:7][C:8]1[CH:9]=[CH:10][C:11]([F:33])=[C:12]([C:15]([C:17]2[C:21]3[CH:22]=[C:23]([C:26]4[CH:27]=[CH:28][C:29]([Cl:32])=[CH:30][CH:31]=4)[CH:24]=[N:25][C:20]=3[NH:19][CH:18]=2)=[O:16])[C:13]=1[F:14])(=[O:6])=[O:5].[ClH:34]Vemurafenib (97.8 g, 199.6 mmol) was suspended in 900 mL acetone and the mixture was warmed to 35° C. While maintaining this temperature, 200 ml of 1.25 M HCl in ethanol (250 mmol HCl, 1.25 equivalents) were added dropwise. A clear solution was obtained. Thereafter, the solution was stirred for another 5 min at 35° C. and then allowed to cool to RT and stirred overnight. The obtained precipitate was filtered, washed with acetone and dried at 40° C. under reduced pressure (30 mbar) for approximately 16 h. Yield: 95.8 g (91%)
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