Br[C:2]1[CH:3]=[C:4]([C:8]2([CH:13]([CH3:15])[CH3:14])[O:12][CH2:11][CH2:10][O:9]2)[CH:5]=[CH:6][CH:7]=1.C([Li])CCC.CN([CH:24]=[O:25])C.[Cl-].[NH4+]>C1COCC1>[CH:24]([C:2]1[CH:3]=[C:4]([C:8]2([CH:13]([CH3:15])[CH3:14])[O:12][CH2:11][CH2:10][O:9]2)[CH:5]=[CH:6][CH:7]=1)=[O:25]110 mg of 2-(3-bromophenyl)-2-isopropyl-1,3-dioxolane was dissolved in 1 mL of THF, and cooled to −78° C., and 0.36 mL of n-butyl lithium (1.5 M hexane solution) was added thereto, followed by stirring for 15 minutes. Thereafter, DMF (0.53 mL) was added thereto, followed by stirring at room temperature for 1 hour. A saturated aqueous ammonium chloride solution was added to the reaction liquid, followed by extraction with diethyl ether. The organic layer was then washed with saturated brine, dried over anhydrous sodium sulfate and then concentrated under reduced pressure to obtain 57 mg (yield 61%) of a title compound as a pale yellow oily substance.
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