反应详情

温度

0 °C

1-(1-Ethyl-6-methoxy-1-H-indole-3-yl)ethanone oxime (100 mg, 0.43 mmol) is dissolved in THF (900 μL) at 0° C. n-BuLi (450 μL, 2.5 M in hexanes, 1.12 mol) is added dropwise, resulting in instant precipitation of solids. DMF (70 μL, 0.9 mol) in 260 μL of THF is then added dropwise. This is stirred at 0° C. for 1 h, then at room temperature for 1 h. The reaction mixture is pipetted into a mixture containing 1 mL of H2O, 1 mL of THF, and 100 mL of concentrated H2SO4. This mixture is heated at 75° C. for 1 h and then is partitioned between H2O and EtOAc. The organic phase is dried and concentrated. Purification by column chromatography (CH2Cl2) yields 1-ethyl-3-isoxazol-3-yl-6-methoxy-1-H-indole product as a white solid (13 mg, 12%).

1. additionis added dropwise
2. customresulting in instant precipitation of solids
3. waitat room temperature for 1 h
4. temperatureThis mixture is heated at 75° C. for 1 h
5. customis partitioned between H2O and EtOAc
6. customThe organic phase is dried
7. concentrationconcentrated
8. customPurification by column chromatography (CH2Cl2)