[Mg].Cl[Si:3]([CH3:6])([CH3:5])[CH3:4].CN(C=O)C.Cl[C:13]([F:20])([F:19])[C:14]([O:16][CH2:17][CH3:18])=[O:15]>O>[CH2:17]([O:16][C:14](=[O:15])[C:13]([F:20])([F:19])[Si:3]([CH3:6])([CH3:5])[CH3:4])[CH3:18]According to the above-described scheme, magnesium (243 mg, 10.0 mmol), chlorotrimethylsilane (Me3SiCl; 2.17 g, 20.0 mmol) and DMF (15 mL) were put into a two-neck reaction tube under nitrogen atmosphere. Ethyl chlorodifluoroacetate (Compound 3; 793 mg, 624 μL, 5.0 mmol) was added thereto with the reaction container being cooled in water bath, and then the mixture was stirred at room temperature for 1.5 hours. The reaction mixture was extracted with diethyl ether and washed with water, and an organic layer was dried with anhydrous sodium sulfate. Diethyl ether was distilled away under reduced pressure, and by carrying out the production by silica gel column chromatography, difluorotrimethylsilanylacetic acid ethyl ester (Compound 3a) was obtained with a yield of 43%.
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