Dimethylformamide → ethyl 5-[4-({4-[({4-[(E)-2-(diethoxyphosphoryl)ethenyl]-1-phenyl-1H-pyrazol-3-yl}oxy)methyl]-2-methoxyphenoxy}methyl)-5-methyl-1,3-oxazol-2-yl]-2-furancarboxylate

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To a mixture of ethyl 5-{4-[(4-{[(4-formyl-1-phenyl-1H-pyrazol-3-yl)oxy]methyl}-2-methoxyphenoxy)methyl]-5-methyl-1,3-oxazol-2-yl}-2-furancarboxylate (0.70 g), tetraethyl methylenediphosphonate (0.40 g) and N,N-dimethylformamide (20 mL) was added sodium hydride (60% in oil, 0.06 g) at room temperature, and the mixture was stirred at the same temperature for 2 hrs. Water was poured into the reaction mixture, and the mixture was extracted with ethyl acetate. The organic layer was washed with saturated brine, dried over anhydrous magnesium sulfate and concentrated. The residue was subjected to silica gel column chromatography to give ethyl 5-[4-({4-[({4-[(E)-2-(diethoxyphosphoryl)ethenyl]-1-phenyl-1H-pyrazol-3-yl}oxy)methyl]-2-methoxyphenoxy}methyl)-5-methyl-1,3-oxazol-2-yl]-2-furancarboxylate as colorless crystals (0.41 g, yield 46%) from a fraction eluted with acetate-hexane (9:1, v/v). Recrystallization from ethyl ethyl acetate-hexane gave colorless prism crystals. melting point: 129-130° C.

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