[CH3:1][O:2][C:3]1[CH:10]=[CH:9][C:6]([CH:7]=O)=[CH:5][C:4]=1[O:11][CH2:12][O:13][CH3:14].O1CCCC1.C(OP([CH2:28][C:29]([O:31][CH2:32][CH3:33])=[O:30])(OCC)=O)C.[H-].[Na+]>CN(C)C=O>[CH3:1][O:2][C:3]1[CH:10]=[CH:9][C:6](/[CH:7]=[CH:28]/[C:29]([O:31][CH2:32][CH3:33])=[O:30])=[CH:5][C:4]=1[O:11][CH2:12][O:13][CH3:14]
The compound (3.42 g, 17.4 mmol) of Example 9-1 was dissolved in N,N-dimethylformamide (30 ml) and tetrahydrofuran (30 ml) and then thereto were added ethyl diethylphosphonoacetate (3.91 g, 17.4 mmol) and sodium hydride (766 mg, 19.1 mmol). After stirring for 2 hours at 60° C., the mixture was allowed to cool to room temperature, and tetrahydrofuran was removed under reduced pressure. To the residue was added water, and the mixture was extracted with ethyl acetate-toluene (3:1). The organic layer was washed with water and an aqueous saturated sodium chloride solution in the order, dried over anhydrous magnesium sulfate. The solvent was removed under reduced pressure to give the subject compound (196 mg, 88.8%).
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