反应详情

7-Methoxyquinoxalin-2(1H)-one (synthesized with reference to WO2009/1126; 400 mg, 2.27 mmol) was dissolved in N,N-dimethylformamide (8 ml). The solution was cooled in an ice bath, lithium hydride (purity 90%, 26 mg, 2.95 mmol) was then added thereto and the mixture was stirred at room temperature for 40 minutes. The reaction solution was cooled in an ice bath again, (4-bromobutoxy)(tert-butyl)dimethylsilane (synthesized with reference to Journal of Medicinal Chemistry, 2008, vol. 51, No. 18, pages 5690-5701; 580 mg, 2.17 mmol) and sodium iodide (442 mg, 2.95 mmol) were added thereto, and the mixture was stirred overnight at room temperature. The reaction mixture was diluted with ethyl acetate, washed sequentially with saturated sodium chloride solution (×2), water and saturated sodium chloride solution, dried over anhydrous magnesium sulfate and the solvent was removed under reduced pressure. The obtained residue was purified by silica gel column chromatography (n-hexane/ethyl acetate) to yield 363 mg (44%) of the title compound in the form of a light yellow syrup.

1. temperatureThe solution was cooled in an ice bath
2. temperatureThe reaction solution was cooled in an ice bath again
3. stirringthe mixture was stirred overnight at room temperature
4. washwashed sequentially with saturated sodium chloride solution (×2), water and saturated sodium chloride solution
5. dry with materialdried over anhydrous magnesium sulfate
6. customthe solvent was removed under reduced pressure
7. customThe obtained residue was purified by silica gel column chromatography (n-hexane/ethyl acetate)