Dimethylformamide → ethyl (2E)-3-[5-({4-[(5-methyl-2-phenyl-1,3-oxazol-4-yl)methoxy]phenoxy}methyl)-2-phenyl-1,3-oxazol-4-yl]-2-propenoate

Beteiligte Stoffe

Reaktionsschritte

To a mixture of 5-({4-[(5-methyl-2-phenyl-1,3-oxazol-4-yl)methoxy]phenoxy}methyl)-2-phenyl-1,3-oxazole-4-carbaldehyde (1.0 g), ethyl diethylphosphonoacetate (0.52 g) and N,N-dimethylformamide (20 mL) was added sodium hydride (60% in oil, 0.10 g) at room temperature, and the mixture was stirred at the same temperature for 3 hrs. The reaction mixture was poured into water 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 (2E)-3-[5-({4-[(5-methyl-2-phenyl-1,3-oxazol-4-yl)methoxy]phenoxy}methyl)-2-phenyl-1,3-oxazol-4-yl]-2-propenoate as colorless crystals (0.55 g, yield 49%) from a fraction eluted with ethyl acetate-hexane (1:4, v/v). Recrystallization from ethyl acetate-hexane gave colorless prism crystals. melting point: 107-108° C.

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