反应详情

温度

20 °C

To a suspension of 0.2 g of 5-dimethylaminopyridine-2-amine in 3 mL of DME are added 215 μL of ethyl bromopyruvate. The reaction mixture is stirred at 20° C. for 16 hours and then, after addition of 3 mL of ethanol, for 16 hours at reflux, and finally concentrated under reduced pressure. The residue is filtered on a cartridge of 15 g of silica, eluting with a mixture of dichloromethane and methanol (98/2). The fractions containing the expected product are combined and washed with saturated sodium bicarbonate solution. The organic phase is dried and concentrated to dryness under reduced pressure to give 76 mg of ethyl 6-dimethylaminoimidazo[1,2-a]pyridine-2-carboxylate in the form of a green oil, which is used without further purification in the rest of the synthesis.

1. temperaturefor 16 hours at reflux
2. concentrationfinally concentrated under reduced pressure
3. filtrationThe residue is filtered on a cartridge of 15 g of silica
4. washeluting with a mixture of dichloromethane and methanol (98/2)
5. additionThe fractions containing the expected product
6. washwashed with saturated sodium bicarbonate solution
7. customThe organic phase is dried
8. concentrationconcentrated to dryness under reduced pressure