Potassium Carbonate → 3-Chloro-5-[methyl(propyl)amino]pyrazine-2-carbaldehyde

Participants

Reaction Steps

A solution of 2,6-dichloropyrazine (4.47 g), N-methylpropan-1-amine (4.6 mL) and potassium carbonate (6.20 g) in DMA (30 mL) was stirred at 80° C. for 16 hr. Water was added to the reaction mixture, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine and dried over magnesium sulfate, and the solvent was evaporated under reduced pressure to give a crude product. Phosphoryl chloride (5.5 mL) was added dropwise to DMF (30 mL) at 0° C., and the mixture was stirred for 30 min. To this reaction mixture was added a solution of the obtained crude product in DMF (10 mL), and the mixture was stirred at 50° C. for 14 hr. Water was added to the reaction mixture and the mixture was stirred for 1 hr and extracted with ethyl acetate. The extract was washed with water and saturated brine and dried over magnesium sulfate, and the solvent was evaporated under reduced pressure. The residue was recrystallized from diisopropyl ether to give the title compound (4.76 g, 74%).

Provenance & Evidence