Dichloromethane → HCID 20072898, compound

Participants

Reaction Steps

To a suspension of methyl 7-carbamoylimidazo[1,2-a]-pyridine-2-carboxylate (1.5 g), methylene chloride (30 ml) and pyridine (2.7 g) was dropwise added trifluoroacetic anhydride (3.6 g) over the period of 5 minutes under cooling with stirring, and the mixture was stirred for 30 minutes at the same temperature. The reaction mixture was poured into ice water (30 ml) and extracted with 5% solution of methanol in chloroform. The organic layer was dried over magnesium sulfate and concentrated. The residue was subjected to a column chromatography on silica gel (50 g) and eluted with 20% solution of methanol in chloroform. The fractions containing the object compound were combined and concentrated to give methyl 7-cyanoimidazo[1,2-a]pyridine-2-carboxylate (0.4 g).

Provenance & Evidence