Br[C:2]1[CH:7]=[CH:6][C:5]([S:8][CH2:9][CH2:10][C:11]([NH2:13])=[O:12])=[C:4]([C:14]([F:17])([F:16])[F:15])[CH:3]=1.[CH3:18][N:19]1[CH:23]=[C:22](B2OC(C)(C)C(C)(C)O2)[CH:21]=[N:20]1.C(=O)([O-])[O-].[K+].[K+].O>CN(C)C=O.COC(C)(C)C>[CH3:18][N:19]1[CH:23]=[C:22]([C:2]2[CH:7]=[CH:6][C:5]([S:8][CH2:9][CH2:10][C:11]([NH2:13])=[O:12])=[C:4]([C:14]([F:17])([F:16])[F:15])[CH:3]=2)[CH:21]=[N:20]1
3-(4-Bromo-2-trifluoromethyl-phenylsulfanyl)-propionamide (160 g, 488 mmol) was dissolved under Ar in N,N-dimethylformamide (1.5 L) before 1-methyl-4-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-1H-pyrazole (143 g, 687 mmol), potassium carbonate (160 g, 1.16 mol), and water (130 mL) were added. The solution was degassed and tetrakis-(triphenylphosphine)palladium(0) (24.0 g, 20.8 mmol) was added. The mixture was stirred for 16 h at 50° C. After cooling to room temperature, the mixture was poured onto water (5 L) and extracted with ethyl acetate (1×3 L, 2×1 L). The combined organic extracts were washed with brine (1 L), the volume was reduced in vacuo to ca. 2 L and dried over sodium sulfate. The resulting filtrate was further reduced in vacuo until precipitation occurred and a homogeneous slurry was formed. Tert-butyl methyl ether (1 L) was then added in portions to the distillation, keeping the overall volume constant (solvent exchange). The suspension was cooled to 5° C. (ice bath) and filtered. The precipitate was washed with tert-butyl methyl ether (500 mL) and dried in vacuo to provide 141 g of the title compound as brown crystalline solid (88%). MS (ESI & APCI): m/z=330.1 [M+H]. 1H NMR (CDCl3, 600 MHz): δ 2.54 (t, J=7.4 Hz, 2H), 3.27 (t, J=7.4 Hz, 2H), 5.39 (bs, 1H), 5.52 (bs, 1H), 7.56 (s, 1H), 7.57 (s, 1H), 7.66 (s, 1H), 7.73 (bs, 1H), 7.77 (d, J=0.7 Hz, 1H).
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