反应详情

To a solution of 3-bromo-4-pyridinol (308.2 mg, 1.771 mmol) in N,N-dimethylformamide (10 mL, 100 mmol) was added potassium carbonate (371.0 mg, 2.684 mmol) and methyl iodide (133 uL, 2.14 mmol). The reaction was stirred at room temperature for 18 hours. The reaction mixture was filtered and evaporated in vacuo. The crude product was purified via flash chromatography on silica gel (12 g silica, solvent gradient: 0-20% methanol in dichloromethane) to yield 269.9 mg (81%) of 3-bromo-1-methylpyridin-4(1H)-one. LCMS (ESI): M+H=188.2; 1H NMR (400 MHz, DMSO-d6) δ 8.24 (d, J=2.1 Hz, 1H), 7.68 (dd, J=7.4, 2.1 Hz, 1H), 6.21 (d, J=7.4 Hz, 1H), 3.65 (s, 3H).

1. filtrationThe reaction mixture was filtered
2. customevaporated in vacuo
3. customThe crude product was purified via flash chromatography on silica gel (12 g silica, solvent gradient: 0-20% methanol in dichloromethane)