Sodium Iodide → 1-(3,3-Dimethoxypropyl)-7-methoxyquinoxalin-2(1H)-one

Participants

Reaction Steps

7-Methoxyquinoxalin-2(1H)-one (synthesized with reference to WO2009/1126; 4.13 g, 23.4 mmol) was dissolved in N,N-dimethylformamide (103 ml). The solution was cooled in an ice bath, lithium hydride (purity 90%, 248 mg, 28.1 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, 3-bromo-1,1-dimethoxypropane (3.78 ml, 28.1 mmol) and sodium iodide (4.21 g, 28.1 mmol) were added and then the mixture was stirred at room temperature for 2 days. The reaction solution was diluted with ethyl acetate, washed sequentially with saturated sodium chloride solution (×2), water and saturated sodium chloride solution, dried over 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 4.68 g (72%) of the title compound in the form of a yellow syrup.

Provenance & Evidence