Butyl Acetate → Ethyl 1-ethyl-5-(4-fluorophenyl)-1,4-dihydro-4-oxo-3-pyridinecarboxylate

Participants

Reaction Conditions

Reaction Steps

N,N-Dimethylformamide dimethylacetal (3.9 ml) was added to a solution of ethyl 4-(4-fluorophenyl)-3-oxobutanoate (1310 mg) in n-butyl acetate (15 ml) at room temperature, and the mixture was stirred at 90° C. for five hours. The solvent was distilled off under reduced pressure, and ethanol (20 ml) was added, followed by addition of ethylamine (2 M solution in THF, 4.4 ml). After stirring at 60° C. for two hours, ethylamine (2 M solution in THF, 3.0 ml) was added and the mixture was further stirred at 60° C. for two hours. The solvent was distilled off under reduced pressure, and the residue was purified by silica gel column chromatography [chloroform:methanol=300:1->70:1 (v/v)] to give 985 mg of the title compound as an oily substance.

Provenance & Evidence