反应详情

温度

50 °C

To a mixture of 3-benzyl-6-ethylthieno[2,3-d]pyrimidine-2,4(1H,3H)-dione (1 g), 3-[4′-(bromomethyl)biphenyl-2-yl]-5-(trichloromethyl)-1,2,4-oxadiazole (1.66 g) and N,N-dimethylformamide (50 mL) was added sodium hydride (0.15 g), and the mixture was stirred at 50° C. for 1 hr. The reaction mixture was diluted with ethyl acetate, washed successively with 5% aqueous potassium hydrogensulfate solution and saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure. To the obtained residue was added 1N aqueous sodium hydroxide solution (50 mL), and the mixture was stirred at 60° C. for 1 hr. The reaction mixture was adjusted to pH 4 with 1N hydrochloric acid, and extracted with ethyl acetate. The obtained ethyl acetate layer was washed with saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography, and the obtained solid was recrystallized from tetrahydrofuran-diethyl ether to give the title compound as colorless crystals (1.12 g, 60%).

1. washwashed successively with 5% aqueous potassium hydrogensulfate solution and saturated brine
2. dry with materialdried over anhydrous magnesium sulfate
3. customThe solvent was evaporated under reduced pressure
4. additionTo the obtained residue was added 1N aqueous sodium hydroxide solution (50 mL)
5. stirringthe mixture was stirred at 60° C. for 1 hr
6. extractionextracted with ethyl acetate
7. washThe obtained ethyl acetate layer was washed with saturated brine
8. dry with materialdried over anhydrous magnesium sulfate
9. customThe solvent was evaporated under reduced pressure
10. customThe residue was purified by silica gel column chromatography
11. customthe obtained solid was recrystallized from tetrahydrofuran-diethyl ether