[C:1]([O:6][CH:7]([CH2:14][CH3:15])[C:8]([C:11]([OH:13])=[O:12])([F:10])[F:9])(=[O:5])[C:2]([CH3:4])=[CH2:3].C1[CH2:20][O:19][CH2:18]C1.COCCl>O>[C:1]([O:6][CH:7]([CH2:14][CH3:15])[C:8]([C:11]([O:13][CH2:18][O:19][CH3:20])=[O:12])([F:10])[F:9])(=[O:5])[C:2]([CH3:4])=[CH2:3]Under nitrogen, a 20 mL reactor was charged with 70 mg (0.25 mmol) of 1-hydroxycarbonyl-1,1-difluoro-2-butyl methacrylate (purity: 78%) and 3 mL of THF (dehydrated one), followed by cooling to 0° C. Then, 65 μL (0.47 mmol, 1.9 eq) was added, followed by stirring at 0° C. for 10 min. Then, 30 μL (0.40 mmol, 1.6 eq) of chloromethyl methyl ether was added, followed by stirring at 0° C. for 20 min. Then, 5 mL of water was added to the reaction solution, followed by extraction with diisopropyl ether two times and removal of water with magnesium sulfate. After conducting filtration, diisopropyl ether was distilled off, thereby obtaining 58 mg of the target 1-(methoxymethyl)oxycarbonyl-1,1-difluoro-2-butyl methacrylate. Upon this, purity was 96%, and yield was 83%.
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