Ethanol → Ethyl 6-dimethylaminoimidazo[1,2-a]pyridine-2-carboxylate

참여 물질

반응 조건

반응 단계

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.

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