反应详情

温度

20 °C

215 μl of ethyl bromopyruvate are added to a suspension of 0.2 g of 5-dimethylaminopyridine-2-amine in 3 ml of DME. The reaction mixture is stirred at 20° C. for 16 hours, 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 comprising 15 g of silica, elution being carried out with a mixture of dichloromethane and methanol (98/2). The fractions comprising the expected product are combined and washed with a saturated sodium bicarbonate solution. The organic phase is dried and concentrated to dryness under reduced pressure to give 76 mg of ethyl 6-dimethylamino-imidazo[1,2-a]pyridine-2-carboxylate in the form of a green oil used as is in the continuation of the synthesis.

1. temperaturefor 16 hours at reflux
2. concentrationfinally, concentrated under reduced pressure
3. filtrationThe residue is filtered on a cartridge
4. wash15 g of silica, elution
5. additionbeing carried out with a mixture of dichloromethane and methanol (98/2)
6. washwashed with a saturated sodium bicarbonate solution
7. customThe organic phase is dried
8. concentrationconcentrated to dryness under reduced pressure