[H-].[Na+].[CH2:3]([OH:7])[C:4]#[C:5][CH3:6].[Cl:8][C:9]1[C:14]([F:15])=[C:13](Cl)[N:12]=[CH:11][N:10]=1.[Cl-].[NH4+]>O1CCCC1>[CH2:3]([O:7][C:13]1[C:14]([F:15])=[C:9]([Cl:8])[N:10]=[CH:11][N:12]=1)[C:4]#[C:5][CH3:6]0.61 g of sodium hydride (60% oil suspension) was suspended in 20 ml of tetrahydrofuran. 1 ml of tetrahydrofuran solution of 0.73 g of 2-butyn-1-ol was added dropwise at 0° C. therein, and the mixture was stirred for 10 minutes. Into the mixture was added dropwise 5 ml of tetrahydrofuran solution of 1.75 g of 4,6-dichloro-5-fluoropyrimidine, and stirred for 90 minutes at 0° C. The reaction mixture was poured into a saturated ammonium chloride aqueous solution, and the mixture was extracted with tert-butyl methyl ether three times. The organic layers were washed with a saturated sodium chloride aqueous solution, dried over anhydrous magnesium sulfate and concentrated. The residue was subjected to silica gel column chromatography to obtain 1.8 g of 4-(2-butynyloxy)-6-chloro-5-fluoropyrimidine.
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