[Cl:1][C:2]1[C:6]([N:7]([CH2:14][C:15]#[CH:16])[C:8](=[O:13])[CH:9]([S:11][CH3:12])[CH3:10])=[CH:5][N:4]([C:17]2[CH:18]=[N:19][CH:20]=[CH:21][CH:22]=2)[N:3]=1.B1([O-])OO1.[OH2:27].[OH2:28].O.O.[Na+].C([O-])(O)=O.[Na+]>C(O)(=O)C>[Cl:1][C:2]1[C:6]([N:7]([CH2:14][C:15]#[CH:16])[C:8](=[O:13])[CH:9]([S:11]([CH3:12])(=[O:28])=[O:27])[CH3:10])=[CH:5][N:4]([C:17]2[CH:18]=[N:19][CH:20]=[CH:21][CH:22]=2)[N:3]=1To a solution of N-(3-chloro-1-(pyridin-3-yl)-1H-pyrazol-4-yl)-2-(methylthio)-N-(prop-2-yn-1-yl)propanamide (0.10 g, 0.30 mmol) and acetic acid (2.0 ml) was added sodium perborate tetrahydrate (0.11 g, 0.74 mmol) and the vial was heated to 65° C. for 2 h. The reaction mixture was cooled to ambient temperature and neutralized with saturated NaHCO3. The aqueous layer was extracted with EtOAc (3×). The organic layers were combined, dried over Na2SO4, filtered and concentrated. The residue was purified using silica gel chromatography (0-20% MeOH/DCM) to afford the title compound as a yellow foam (84 mg, 0.21 mmol, 73%): 1H NMR (400 MHz, CDCl3) δ 9.00 (s, 1H), 8.65 (s, 1H), 8.29 (s, 1H), 8.03 (d, J=8.0 Hz, 1H), 7.54-7.39 (m, 1H), 4.89 (d, J=16.9 Hz, 1H), 4.20-4.08 (m, 1H), 4.07-3.92 (m, 1H), 3.01 (s, 3H), 2.34-2.29 (m, 1H), 1.67 (d, J=7.0 Hz, 3H); 13C NMR (101 MHz, CDCl3) δ 166.97, 166.90, 148.77, 140.43, 140.24, 135.58, 129.36, 126.64, 124.14, 121.34, 73.80, 60.91, 38.78, 36.29, 13.97; ESIMS m/z 367 ([M+H]+).
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