反应详情

温度

40 °C

To a mixture of (5-methyl-2-phenyl-4-oxazolyl)methanol (8.51 g) and tetrahydrofuran (100 mL) was added sodium hydride (60%, oil, 1.80 g) at room temperature and the reaction mixture was stirred at room temperature until generation of hydrogen ended. The mixture was added to a solution of methyl 6-chloropyridine-2-carboxylate (7.72 g) in tetrahydrofuran (75 ml) at room temperature and the obtained mixture was further stirred at 40° C. for 5 hrs. Water was added to the reaction mixture and the mixture was extracted with ethyl acetate. The organic layer was washed successively with water and saturated brine, dried over anhydrous magnesium sulfate, and concentrated. The obtained residue was subjected to silica gel column chromatography to give crystals of methyl 6-(5-methyl-2-phenyl-4-oxazolyl)methoxy-2-pyridinecarboxylate from a fraction eluted with ethyl acetate-hexane (1:3, v/v). Recrystallization from ethyl acetate-hexane gave pale-yellow plate crystals (7.41 g, 51%). melting point: 97-98° C.

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