反应详情

温度

2.5 °C

8-amino-2,3-dimethylimidazo[1,2-a]pyridine (0.5 g, 3.1 mmol), 4-methoxy-2.6-dimethylbenzaldehyd (0.51 g, 3.11 mmol) were dissolved in methanol (10 ml) whereupon zinc chloride (0.51 g, 3.82 mmol) dissolved in methanol (5 ml) was added. Sodium cyanoborohydride was added in portions and the mixture was refluxed for 3 h under under nitrogen. The mixture was stirred at 0-5° C. and 1 M sodium hydroxide (20 ml) was added. After extraction with 2×50 ml of methylene chloride the combined organic layer was washed with water and dried over sodium sulfate. The solvent was removed under reduced pressure. The residue was chromatographed on silica (dichloromethane: ethyl acetate. 1:1) yielding 0.58 g 60% of the title compound.

1. additionwas added
2. temperaturethe mixture was refluxed for 3 h under under nitrogen
3. extractionAfter extraction with 2×50 ml of methylene chloride the combined organic layer
4. washwas washed with water
5. dry with materialdried over sodium sulfate
6. customThe solvent was removed under reduced pressure
7. customThe residue was chromatographed on silica (dichloromethane: ethyl acetate. 1:1)