Ethyl bromopyruvate → Ethyl 7-bromoimidazo(1,2-a)pyridine-2-carboxylate
反応式
[NH2:1][C:2]1[CH:7]=[C:6]([Br:8])[CH:5]=[CH:4][N:3]=1.Br[CH2:10][C:11](=O)[C:12]([O:14][CH2:15][CH3:16])=[O:13]>C(#N)C>[Br:8][C:6]1[CH:5]=[CH:4][N:3]2[CH:10]=[C:11]([C:12]([O:14][CH2:15][CH3:16])=[O:13])[N:1]=[C:2]2[CH:7]=1参加物
4
実験手順
0.6 g (3.47 mmol) of 2-amino-4-bromopyridine, 1.55 g (7.15 mmol) of ethyl bromopyruvate and 4 mL of acetonitrile are placed in a 20 mL screw-topped tube equipped with a magnetic bar. The top is then screwed on and the tube is stirred at room temperature for 1 hour, and then heated at 150° C. with stirring for 30 minutes. After this time and cooling to room temperature, the precipitate obtained is filtered off, rinsed with acetonitrile and dried. The filtrate is concentrated to dryness and then purified by chromatography on a column of silica gel, eluting with a mixture of dichloromethane and methanol. The solid obtained after evaporating off the solvent is dried under reduced pressure. 530 mg of the expected product are obtained in total.