[H-].[Na+].Cl[C:4]1[CH:9]=[C:8]([O:10][CH3:11])[N:7]=[C:6]([S:12][CH3:13])[N:5]=1.[C:14]([O:19][CH3:20])(=[O:18])[CH:15]([CH3:17])[OH:16].CN(C)C=O>O>[CH3:11][O:10][C:8]1[N:7]=[C:6]([S:12][CH3:13])[N:5]=[C:4]([O:16][CH:15]([C:14]([O:19][CH3:20])=[O:18])[CH3:17])[CH:9]=1
0.4 g of sodium hydride was added to a mixture of 1.59 g of 4-chloro-6-methoxy-2-methylthiopyrimidine, 1.13 g of methyl lactate and 10 ml of N,N-dimethylformamide at 0° C. The mixture was stirred at room temperature for 5 hours, then, the reaction solution was poured into water, and extracted with ethyl acetate. The organic layer was washed with saturated saline, dried over anhydrous magnesium sulfate, and concentrated. The residue was subjected to silica gel column chromatography to obtain 1.5 g of 6-methoxy-4-{1-(methoxycarbonyl)ethoxy}-2-methylthiopyrimidine.
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