Triethylamine → HCID 178515073, compound

Participants

Reaction Steps

To a stirred suspension of dimethyl7-chloro-4-hydroxyquinoline-2,3-dicarboxylate (2.59 g, 8.79 mM) and 4-fluorophenyl hydrazine hydrochloride (10.0 g, 61.5 mM) in ethanol (48 mL) was added triethylamine (9.8 mL, 70.3 mM). The resulting brown solution was refluxed for 48 hours, cooled to room temperature and dilutedwith ethyl acetate (150 mL) to give a white crystalline precipitate which was removed by filtration and discarded. The filtrate was washed with hydrochloric acid (3×500 mL, 1N) which caused precipitation in the ethyl acetate layer. The precipitate was collected and washed successivelywith ethyl acetate/ether and ether to give the 4-fluorophenyl hydrazine salt of the title compound (2.14 g). This material was refluxed in glacialacetic acid (20 mL) for 2 hours. After cooling the acetic acid solution to room temperature, a precipitate formed and the solids were collected to give the title compound (1.48 g, 47%) as a yellow powder, mp 390°-392° C.; MS(CI): 358 (M+H).

Provenance & Evidence