反应详情

A mixture of 4-nitrophenol (5.48 g), 4-chloromethyl-2-ethyl-1,3-thiazole (7.40 g), potassium carbonate (5.45 g) and N,N-dimethylformamide (50 mL) was stirred at room temperature for 15 hrs. Water was poured into the reaction mixture, and the mixture was extracted with ethyl acetate. The organic layer was washed successively with 1N aqueous sodium hydroxide solution and saturated brine, dried over anhydrous magnesium sulfate and concentrated. The residue was subjected to silica gel column chromatography to give 2-ethyl-4-[(4-nitrophenoxy)methyl]-1,3-thiazole as colorless crystals (3.60 g, yield 35%) from a fraction eluted with hexane-ethyl acetate (4:1, v/v). Recrystallization thereof from ethyl acetate-hexane gave colorless prism crystals. melting point: 79-80° C.

1. extractionthe mixture was extracted with ethyl acetate
2. washThe organic layer was washed successively with 1N aqueous sodium hydroxide solution and saturated brine
3. dry with materialdried over anhydrous magnesium sulfate
4. concentrationconcentrated