Hydrochloric Acid → HCID 178422969, compound

Participants

Reaction Steps

Ethyl 4-hydroxy-7-methyl-3-quinolinecarboxylate (32 g, 138 mmol) was suspended in sodium hydroxide (500 mL of 10% aqueous) and then heated at reflux for about 30 minutes. The reaction mixture was allowed to cool to ambient temperature and then it was acidified with concentrated hydrochloric acid. The resulting precipitate was isolated by filtration, rinsed well with water and then oven dried to provide 4-hydroxy-7-methyl-3-quinolinecarboxylic acid (28 g). A portion (2 g) was recrystallized twice from N,N-dimethylforrnamide to give a fluffy white solid, m.p. 264-265° C. Analysis: Calculated for C11H9NO3: % C, 65.02; % H, 4.46; % N, 6.89; Found: % C, 65.22; % H, 4.42; % N, 6.88.

Provenance & Evidence