[Cl:1][C:2]1[N:7]=[C:6]([Cl:8])[CH:5]=[CH:4][N:3]=1.[CH3:9][C:10]([CH3:13])([O-:12])[CH3:11].[K+].C(OCC)(=O)C>C(O)(C)(C)C>[C:10]([O:12][C:2]1[N:7]=[C:6]([Cl:8])[CH:5]=[CH:4][N:3]=1)([CH3:13])([CH3:11])[CH3:9].[C:10]([O:12][C:6]1[CH:5]=[CH:4][N:3]=[C:2]([Cl:1])[N:7]=1)([CH3:13])([CH3:11])[CH3:9]After dissolving 2.00 g of 2,4-dichloropyrimidine in 30 ml of tert-butanol, 1.58 g of potassium tert-butoxide was added while stirring and the mixture was stirred overnight at room temperature. The reaction mixture was poured onto ice and extraction was performed with ethyl acetate. The organic layer was washed with water and saturated brine in that order and dried over anhydrous magnesium sulfate, and then the solvent was distilled off under reduced pressure. The residue was purified by silica gel column chromatography (solvent: n-hexane/ethyl acetate), to obtain 2-tert-butoxy-4-chloropyrimidine (0.40 g, 16% yield) and 4-tert-butoxy-2-chloropyrimidine (1.28 g, 50% yield).
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