[H-].[Na+].C(OP([CH2:11][C:12]([O:14][CH2:15][CH3:16])=[O:13])(OCC)=O)C.[F:17][C:18]1[CH:27]=[CH:26][CH:25]=[C:24]2[C:19]=1[CH2:20][CH2:21][CH2:22][C:23]2=O>C1(C)C=CC=CC=1>[F:17][C:18]1[CH:27]=[CH:26][CH:25]=[C:24]2[C:19]=1[CH2:20][CH2:21][CH:22]=[C:23]2[CH2:11][C:12]([O:14][CH2:15][CH3:16])=[O:13]To a suspension of 60% sodium hydride (5.00 g) in toluene (250 ml) was added dropwise ethyl diethylphosphonoacetate (23.9 ml) under ice-cooling, and the mixture was stirred at room temperature for 1 hr. Then, a solution of 5-fluoro-3,4-dihydro-2H-naphthalen-1-one (18.0 g) in toluene (50 ml) was added dropwise, and the mixture was stirred at 80° C. for 3 hr. After cooling to room temperature, the reaction mixture was poured into ice water, and the mixture was extracted with toluene. The extract was washed with water and saturated brine, dried over magnesium sulfate, and concentrated under reduced pressure. The obtained residue was purified by silica gel column chromatography (hexane/ethyl acetate) to give ethyl (5-fluoro-3,4-dihydronaphthalen-1-yl)acetate (17.4 g).
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