[H-].[Na+].CCOP([O:11][C:12]([CH3:14])=[O:13])(OCC)=O.[CH2:15]1[CH2:26][C:25]2[C:20](=[CH:21][CH:22]=[CH:23][CH:24]=2)[C:18](=O)[CH2:17][CH2:16]1.[Cl-].[NH4+].[CH:29]1C=CC=C[CH:30]=1>>[CH:24]1[C:25]2[CH2:26][CH2:15][CH2:16][CH2:17][C:18](=[CH:14][C:12]([O:11][CH2:29][CH3:30])=[O:13])[C:20]=2[CH:21]=[CH:22][CH:23]=1A suspension of sodium hydride (60%, 2.25 g) in anhydrous benzene (100 ml) was slowly added with a solution of diethyl phosphonoacetate (14.0 g) in anhydrous benzene (20 ml) at 0° C., and the mixture was stirred at 0° C. for 15 minutes. The mixture was added with a solution of 1-benzosuberone (5.00 g) in anhydrous benzene (30 ml), and the mixture was stirred at 0° C. for 15 minutes, and then refluxed overnight by heating. The reaction mixture was left to cool and then added with saturated aqueous ammonium chloride, and the mixture was extracted with ethyl acetate. The organic layer was washed successively with water and saturated brine, and dried over anhydrous sodium sulfate. The organic layer was concentrated under reduced pressure, and the resulting residue was purified by silica gel column chromatography (developing solvent: ethyl acetate:n-hexane=1:200) to quantitatively obtain the title compound.
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