[CH3:1][O:2][C:3](=[O:15])[CH:4](P(OCC)(OCC)=O)[CH2:5][CH3:6].[H-].[Na+].[C:18]([O:22][C:23]([C:25]1[S:26][C:27]([CH:30]=O)=[CH:28][CH:29]=1)=[O:24])([CH3:21])([CH3:20])[CH3:19]>O1CCCC1>[C:18]([O:22][C:23]([C:25]1[S:26][C:27](/[CH:30]=[C:4](/[C:3]([O:2][CH3:1])=[O:15])\[CH2:5][CH3:6])=[CH:28][CH:29]=1)=[O:24])([CH3:21])([CH3:20])[CH3:19]2-(Diethylphosphono)butyric acid methyl ester (46 g, 0.193 mol) was dissolved in tetrahydrofuran (300 mL), 60% sodium hydride (6.6 g, 0.165 mol) was added at 0° C., and the mixture was stirred for 30 minutes. To the reaction mixture was added a solution of 5-formyl-2-thiophenecarboxylic acid tert-butyl ester obtained in Example 1, step 2 (32.1 g, 0.15 mol) in tetrahydrofuran (10 mL), and the mixture was stirred at room temperature for 2 hours. The solvent was evaporated, and the residue was partitioned between ethyl acetate and 1N-hydrochloric acid solution, and washed successively with water and brine. After drying over anhydrous magnesium sulfate, the residue was purified by silica gel column chromatography to give the title compound (35.6 g, 0.12 mol, 80%).
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