Ethanol → 1-Ethyl-3-carboxy-5,6-dimethyl-2-pyridone

Participants

Reaction Conditions

Reaction Steps

1-Ethyl-3-cyano-5,6-dimethyl-2-pyridone (3-003-03) (3.37 g) was dissolved in 80% ethanol (65 mL), and to the reaction mixture was added potassium hydroxide (7.96 g), and the reaction mixture was refluxed with stirring in oil bath at 102° C. for 24 h. The reaction mixture was evaporated under reduced pressure, and to the residue were added water (50 mL) and ethyl acetate (50 mL). After the reaction mixture was stirred under ice-cooling, and was separated by shaking, and to the aqueous layer was conc. hydrochloric acid (13 mL). The resulting crystal was filtered, and washed with cooled water to give 1-ethyl-3-carboxy-5,6-dimethyl-2-pyridone (3-003-04) (2.734 g, 73.3%, m.p. 164-165° C.) as a yellow ocher crystal.

Provenance & Evidence