[H-].[Na+].[CH3:3][NH:4][S:5]([CH3:8])(=[O:7])=[O:6].[Cl:9][C:10]1[N:15]=[C:14]([Cl:16])[C:13]([F:17])=[C:12](Cl)[N:11]=1>CN(C=O)C.C1COCC1>[Cl:9][C:10]1[N:11]=[C:12]([N:4]([CH3:3])[S:5]([CH3:8])(=[O:7])=[O:6])[C:13]([F:17])=[C:14]([Cl:16])[N:15]=1To a solution of NaH (60% in mineral oil, 176 mg, 8.58 mmol) in anhydrous DMF (2 mL), N-methylmethanesulfonamide (436 mg, 4.0 mmol) in DMF (2 ml) was added. This reaction mixture was stirred for 30 min at room temperature and then added dropwise to the solution of 2,4,6-trichloro-5-fluoropyrimidine (804 mg, 4.0 mmol) in THF (30 ml) at 0° C. The reaction mixture was stirred from 0° C. to room temperature overnight. The solvent was evaporated and the residue was purified by silica gel chromatography (by ISCO Combiflash with gradient 0-30% ethyl acetate in Hexane with 1% TEA. A white solid (700 mg) was obtained, yield 64%. NMR (400 MHz, DMSO) 83.38 (s, 3H), 3.31 (s, 3H).
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