Sulfuric Acid → Ethyl 8-bromo-6-methylimidazo[1,2-a]pyridine-3-carboxylate

Participants

Reaction Conditions

Reaction Steps

A mixture of 3-bromo-5-methylpyridin-2-amine (3 g), potassium 2-chloro-3-ethoxy-3-oxoprop-1-en-1-olate (7.6 g), sulfuric acid (0.86 mL) and 2-propanol (60 mL) was stirred at 90° C. for 24 hr. To the reaction mixture was added saturated aqueous sodium bicarbonate solution, and the mixture was extracted with ethyl acetate. The extract was dried over anhydrous magnesium sulfate, and the solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/hexane) to give the title compound (1 g).

Provenance & Evidence