[NH2:1][C:2]1[C:6]([C:7]#[N:8])=[C:5]([C:9]2[CH:14]=[CH:13][C:12]([NH:15][C:16]([NH:18][C:19]3[CH:24]=[C:23]([CH3:25])[CH:22]=[CH:21][C:20]=3[F:26])=[O:17])=[CH:11][CH:10]=2)[S:4][N:3]=1.Cl.CC[O:30]C(C)=O>CCO.[OH-].[Na+].OO>[NH2:1][C:2]1[C:6]([C:7]([NH2:8])=[O:30])=[C:5]([C:9]2[CH:14]=[CH:13][C:12]([NH:15][C:16]([NH:18][C:19]3[CH:24]=[C:23]([CH3:25])[CH:22]=[CH:21][C:20]=3[F:26])=[O:17])=[CH:11][CH:10]=2)[S:4][N:3]=1To a mixture of 1-[4-(3-amino-4-cyanoisothiazol-5-yl)phenyl]-3-(2-fluoro-5-methylphenyl)urea (10.2 mg, 0.028 mmol) in 0.8 mL EtOH at rt was added 15 drops 1.0M aqueous NaOH, 7 drops 30% hydrogen peroxide and the reaction stirred at rt for 30 min, then heated at 60° C. After 2.5 hours an aqueous HCl (dilute) and EtOAc workup was done to give a light yellow solid. To this material was added an impure lot from another reaction, and the combined lots triturated with EtOAc to give the title compound as a pale yellow solid (26 mg, 93% combined yield).
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