C([Li])CCC.[F:6][C:7]1[CH:8]=[C:9]([CH2:15][C:16]([OH:18])=[O:17])[CH:10]=[C:11]([F:14])[C:12]=1[F:13].Br[CH2:20][CH2:21][Cl:22].Cl>CCCCCC.C1COCC1.C(OCC)(=O)C>[Cl:22][CH2:21][CH2:20][CH:15]([C:9]1[CH:8]=[C:7]([F:6])[C:12]([F:13])=[C:11]([F:14])[CH:10]=1)[C:16]([OH:18])=[O:17]A 2.66 M solution of butyl lithium in hexane (20 mL) was added to a solution of 3,4,5-trifluorophenylacetic acid (5.00 g) in THF (150 mL) in a nitrogen atmosphere at −78° C., and the reaction solution was stirred at −78° C. for 20 minutes. The reaction solution was further stirred at 0° C. for one hour. Then, 1-bromo-2-chloroethane (2.2 mL) was added at 0° C., and the reaction solution was stirred at room temperature for 14 hours. Ethyl acetate and 1 N hydrochloric acid were added to the reaction solution, and the organic layer was separated. The resulting organic layer was washed with a saturated sodium chloride solution. The resulting organic layer was dried over magnesium sulfate and then concentrated under reduced pressure. The residue was purified by silica gel column chromatography (elution solvent: heptane-ethyl acetate system) to obtain 4.54 g of the title compound. The property values of the compound are as follows.
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