反应详情

A mixture of 3-cyclopropyl-6-ethylthieno[2,3-d]pyrimidine-2,4(1H,3H)-dione (0.25 g), 3-[4′-(bromomethyl)biphenyl-2-yl]-5-(trichloromethyl)-1,2,4-oxadiazole (0.55 g), potassium carbonate (0.18 g) and N,N-dimethylformamide (10 mL) was stirred at room temperature for 2 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. The obtained residue was purified by silica gel column chromatography and dissolved in tetrahydrofuran (5 mL) and methanol (5 mL). 1N Aqueous sodium hydroxide solution (5 mL) was added, and the mixture was stirred at room temperature for 2 hr. The reaction mixture was adjusted to pH 4 with water and 1N hydrochloric acid, and the mixture was 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 to give the title compound as a colorless amorphous solid (0.3 g, 56%).

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. customThe obtained residue was purified by silica gel column chromatography
5. dissolutiondissolved in tetrahydrofuran (5 mL)
6. addition1N Aqueous sodium hydroxide solution (5 mL) was added
7. stirringthe mixture was stirred at room temperature for 2 hr
8. extractionthe mixture was extracted with ethyl acetate
9. washThe obtained ethyl acetate layer was washed with saturated brine
10. dry with materialdried over anhydrous magnesium sulfate
11. customThe solvent was evaporated under reduced pressure
12. customThe residue was purified by silica gel column chromatography