反应详情

To a solution of (R)-methyl 3-(sec-butylamino)-2-(5-fluorobenzofuran-2-yl)quinoxaline-6-carboxylate (100 mg, 0.33 mmol) in THF (20 mL) was added NaH (90 mg, 2.24 mmol) and CH3I (159 mg, 1.12 mmol). The resulting solution was stirred overnight at room temperature and concentrated in vacuo. The residue was dissolved in water (10 mL) and adjusted to pH 5 with hydrochloric acid (1N). The resulting solution was extracted with dichloromethane (3×10 mL), dried over anhydrous sodium sulfate and then concentrated in vacuo to give a residue, which was purified by silica gel column chromatography eluting (10% dichloromethane in methanol) to afford (R)-3-(sec-butyl(methyl)amino)-2-(5-fluorobenzofuran-2-yl)quinoxaline-6-carboxylic acid as a yellow solid (25 mg, 23%).

1. concentrationconcentrated in vacuo
2. dissolutionThe residue was dissolved in water (10 mL)
3. extractionThe resulting solution was extracted with dichloromethane (3×10 mL)
4. dry with materialdried over anhydrous sodium sulfate
5. concentrationconcentrated in vacuo
6. customto give a residue, which
7. customwas purified by silica gel column chromatography
8. washeluting (10% dichloromethane in methanol)