C(N(CC)[C:4]1[CH:9]=CC=C[CH:5]=1)C.[Cl:12][C:13]1[CH:18]=[CH:17][C:16]([N:19]2[C:24](=[O:25])[CH:23]=[C:22]([C:26]([F:29])([F:28])[F:27])[N:21]([CH3:30])[C:20]2=[O:31])=[C:15]([O:32]CC#C)[CH:14]=1.[F-].[Cs+]>O>[Cl:12][C:13]1[C:14]2[CH:5]=[C:4]([CH3:9])[O:32][C:15]=2[C:16]([N:19]2[C:24](=[O:25])[CH:23]=[C:22]([C:26]([F:29])([F:27])[F:28])[N:21]([CH3:30])[C:20]2=[O:31])=[CH:17][CH:18]=1200 ml of N,N-diethylaniline was added to 20.0 g (55.8 mmol) of 3-(4-chloro-2-propargyloxyphenyl)-1-methyl-6-trifluoromethyluracil and 17.0 g (112 mmol) of cesium fluoride, followed by stirring at 180 to 190° C. for 2 hours. After completion of the reaction, the reaction solution was poured into water and extracted with ethyl acetate. The organic layer was washed sequentially with a 10% hydrochloric acid aqueous solution, water and a saturated sodium chloride aqueous solution and then dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure. Then, the obtained residue was purified by silica gel column chromatography to obtain 7.0 g (yield: 35.0%) of the desired product as white crystals. Melting point: 206-207° C.
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