CN(C)C=O.CS([O:10][CH2:11][CH2:12][C:13]([CH3:17])=[C:14]([F:16])[F:15])(=O)=O.[CH3:18][C:19]1[C:24]([C:25](O)=[O:26])=[CH:23][N:22]=[C:21]([S:28][CH3:29])[N:20]=1.C(=O)([O-])O.[Na+]>O>[CH3:18][C:19]1[C:24]([C:25]([O:10][CH2:11][CH2:12][C:13]([CH3:17])=[C:14]([F:15])[F:16])=[O:26])=[CH:23][N:22]=[C:21]([S:28][CH3:29])[N:20]=1To 40 ml of N,N-dimethylformamide were dissolved 4.00 g (20 mmol) of 4,4-difluoro-3-methyl-3-butenyl methanesulfonate and 4.00 g (22 mmol) of 4-methyl-2-(methylthio)pyrimidine-5-carboxylic acid, followed by the addition of 3.70 g (44 mmol) of sodium hydrogencarbonate and stirring at 100° C. for 3 hours. The reaction liquid was then poured in water and extracted with diethyl ether. The organic layer was washed with water and a saturated saline solution in this order, followed by drying over anhydrous magnesium sulfate, the addition of “Florisil” and filtering. The solution was concentrated under reduced pressure to obtain 5.30 g (yield: 92%) of 4,4-difluoro-3-methyl-3-butenyl 4-methyl-2-(methylthio)-pyrimidine-5-carboxylate.
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