[CH2:1]([OH:5])[CH2:2][CH2:3][CH3:4].[OH-].[K+].CS([C:12]1[N:17]=[C:16]([CH3:18])[C:15]([C:19]([O:21]CC)=[O:20])=[CH:14][N:13]=1)(=O)=O>O>[CH2:1]([O:5][C:12]1[N:17]=[C:16]([CH3:18])[C:15]([C:19]([OH:21])=[O:20])=[CH:14][N:13]=1)[CH2:2][CH2:3][CH3:4]To 1.5 ml of butanol, 0.72 g (11 mmol) of 85.5% potassium hydroxide powder was suspended, followed by drop-wise adding, under ice-cooling, a 1.5 ml of butanol solution dissolving with 1.22 g (5.0 mmol) of ethyl 2-methansulfonyl-4-methylpyrimidine-5-carboxylate. After the end of the drop-wise addition, the solution was stirred at room temperature for 3 hours. To the reaction liquid, 50 ml of water was added, and the water layer was washed with diisopropyl ether, followed by adding 10% hydrochloric acid to make acidic, and extracting with ethyl acetate. The organic layer was washed with water and a saturated saline solution in this order, and dried over anhydrous magnesium sulfate. The solution was concentrated under reduced pressure to obtain 0.87 g (yield: 83%) of 2-butoxy-4-methylpyrimidine-5-carboxylic acid.
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