Hydrochloric Acid → 3-Quinolinecarboxylic acid, 6-bromo-4-(((2S)-2-methoxypropyl)amino)-

Participants

Reaction Conditions

Reaction Steps

Add a solution of sodium hydroxide (296.7 g, 7.42 mol, 6 eq.) in water (454 mL) to a solution of ethyl 6-bromo-4[[(2S)-2-methoxypropyl]amino]quinoline-3-carboxylate (454 g, 1.24 mol) in tetrahydrofuran (4.54 L) at room temperature. Heat the mixture at 50° C. overnight. After 18 hours, cool the reaction to 0° C., add 37% aq. HCl dropwise over 30 minutes until pH=6 (ca. 450 mL) with the temperature under 23° C. Filter the precipitate formed with filter paper and wash it with water (2 L), acetone (2 L) and methyl tert-butyl ether (2 L) subsequently. Dry the white solid to give the titled compound (359 g, 86%). MS (ESI) m/z (M+H)+ 338.9, 340.9.

Provenance & Evidence