反应详情

To a solution of 2,3-diamino-5-methylpyridine (2.0 g, 16 mmol) in ethanol (100 ml) was added 3-bromo-2-butanon (2.4 g, 16 mmol). The reaction mixture was refluxed for 16 h. An additional amount of 3-bromo-2-butanon (1.0 g 6.7 mmol) and triethylamine (1.0 g, 9.9 mmol) were added and the mixture was refluxed for 2 h. The ethanol was evaporated under reduced pressure and the residue was treated with methylene chloride and a solution of bicarbonate. The organic layer was separated, dried over sodium sulfate and evaporated under reduced pressure. The oily residue was purified by column chromatography on silica gel, using methanol:methylene chloride (1:20) as eluent to give the desired product (1.05 g, 37%).

1. temperatureThe reaction mixture was refluxed for 16 h
2. temperaturethe mixture was refluxed for 2 h
3. customThe ethanol was evaporated under reduced pressure
4. additionthe residue was treated with methylene chloride
5. customThe organic layer was separated
6. dry with materialdried over sodium sulfate
7. customevaporated under reduced pressure
8. customThe oily residue was purified by column chromatography on silica gel