反应详情

A stirred suspension of 4-methoxypyridin-2-ylamine (4.50 g, 36.3 mmol), chloroacetaldehyde (8.54 g of a 50 wt % solution in water, 54.4 mmol) and sodium hydrogencarbonate (6.09 g, 72.6 mmol) in ethanol (70 ml) was heated under reflux for 4 h. The solvent was evaporated and the residue partitioned between ethyl acetate and water. The organic layer was washed with brine, dried and evaporated to give an orange oil. Purification by silica gel chromatography eluting with 2% methanol in dichloromethane gave 7-methoxyimidazo[1,2-α]pyridine (2.40 g, 45%) as a brown oil. 1H NMR (400 MHz, CDCl3) δH 3.85 (3H, s), 6.50 (1H, d, J 7), 6.88 (1H, s), 7.41 (1H, s), 7.48 (1H, s), 7.92 (1H, d, J 7).

1. temperatureunder reflux for 4 h
2. customThe solvent was evaporated
3. customthe residue partitioned between ethyl acetate and water
4. washThe organic layer was washed with brine
5. customdried
6. customevaporated
7. customto give an orange oil
8. customPurification by silica gel chromatography
9. washeluting with 2% methanol in dichloromethane