[H-].[Na+].C(OP([CH2:11][C:12]([O:14][CH2:15][CH3:16])=[O:13])(OCC)=O)C.[CH:17]1([C:20]([C:22]2[CH:27]=[C:26]([O:28][CH3:29])[N:25]=[CH:24][N:23]=2)=O)[CH2:19][CH2:18]1.O>C1COCC1>[CH:17]1([C:20]([C:22]2[CH:27]=[C:26]([O:28][CH3:29])[N:25]=[CH:24][N:23]=2)=[CH:11][C:12]([O:14][CH2:15][CH3:16])=[O:13])[CH2:18][CH2:19]1Under a nitrogen atmosphere, to a suspension of 60% sodium hydride (2.13 g) in THF (100 ml) was added ethyl diethylphosphonoacetate (13.2 mL) at 0° C. To the obtained solution was added cyclopropyl(6-methoxypyrimidin-4-yl)methanone (entire amount) obtained in Example 2, step C, and the mixture was stirred at 0° C. for 1 hr. Water was added to the reaction mixture at room temperature, and the mixture was extracted with ethyl acetate. The extract was washed with water and saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure, and the residue was purified by silica gel column chromatography (ethyl acetate/hexane) to give an isomer mixture of the title compound (E:Z=93:7 or 7:93, 5.57 g) as a yellow oil.
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