Sodium Hydroxide → HCID 66746848, compound

Participants

Reaction Steps

To a solution of ethyl 4-amino-5-isobutoxy-2-methylquinoline-3-carboxylate (Example 41a, 18.0 g, 59.53 mmol) in EtOH (150 mL) was added aqueous NaOH solution (3 N, 50 mL) and the reaction mixture was refluxed overnight. It was then cooled down to room temperature and the solution was filtered to remove any possible solid residue. The filtrate was carefully neutralized with 6N HCl to pH 7 at 0° C. The resultant precipitate was collected by filtration, washed with water, re-dissolved in EtOH (700 mL) and water (20 mL), and treated with activated charcoal (650 mg) at 70° C. for 0.5 h. The charcoal was removed by filtration, and the filtrate was concentrated and stored at 4° C. overnight. The resulting precipitate was collected by filtration, washed with cold H2O, and dried under vacuum at 60° C. overnight to give the title compound as a white solid (4.24 g, 26%). M.p.: 203.7° C. 1H NR (400 MHz, DMSO-d6) δ 1.01-1.02 (m, 6H), 2.19-2.24 (m, 1H), 2.77 (s, 3H), 4.05 (d, J=6.4 Hz, 2H), 7.08 (d, J=8.0 Hz, 1H), 7.33 (d, J=8.0 Hz, 1H), 7.71 (t, J=8.0 Hz, 1H), 8.9 (brs, 1H), 11.45 (brs, 1H), 13.2 (brs, 1H). MS 275 (MH+). Elemental Analysis Calculated (Found) for C15H18N2O3.0.75 H2O: C, 62.59% (62.23%); H, 6.83% (7.25%); N, 9.76% (9.73%).

Provenance & Evidence