反应详情

N-(2,4-Dimethoxybenzyl)-6-methoxyquinoxalin-2-amine (2.8 g, 8.61 mmol) was stirred in TFA (10 mL, 130 mmol) and dichloromethane (10 mL) at ambient temperature for 30 min. The solvents were removed in vacuo. Saturated aq. sodium hydrogen carbonate (200 mL) was added to the red residue, which then precipitated a yellow solid. The mixture was extracted extensively with dichloromethane. The organic layer was dried over sodium sulfate, filtered and concentrated in vacuo to afford 6-methoxyquinoxalin-2-amine (1.50 g, 8.56 mmol, 99% yield). 1H NMR (400 MHz, CDCl3) δ ppm 8.27 (1H, s), 7.54-7.58 (1H, m), 7.25-7.29 (2H, m), 4.71 (2H, br. s.), 3.90 (3H, s). MS (LC/MS) R.T.=0.86; [M+H]+=176.23.

1. customThe solvents were removed in vacuo
2. additionSaturated aq. sodium hydrogen carbonate (200 mL) was added to the red residue, which
3. customthen precipitated a yellow solid
4. extractionThe mixture was extracted extensively with dichloromethane
5. dry with materialThe organic layer was dried over sodium sulfate
6. filtrationfiltered
7. concentrationconcentrated in vacuo