Hydrochloric Acid → 3,3-Dimethyl-2-{3-[(4-methyl-piperazine-1-carbonyl)-amino]-phenyl}-1,2,3,4-tetrahydro-quinoline-6-carboxylic acid

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Reaction Conditions

Reaction Steps

A mixture of 3,3-dimethyl-2-{3-[(4-methyl-piperazine-1-carbonyl)-amino]-phenyl}-1,2,3,4-tetrahydro-quinoline-6-carboxylic acid ethyl ester (612 mg, 1.36 mmol) in methanol (15 mL) and tetrahydrofuran (20 mL), 30% sodium hydroxide in water (10 mL) was stirred at 60° C. for 12 h. The mixture was neutralized with a 3 N aqueous hydrochloric acid solution and extracted with ethyl acetate (2×100 mL), washed with water, dried over anhydrous sodium sulfate and then concentrated in vacuo. Purification by Waters automated flash system (column: Xterra 30 mm×100 mm, sample manager 2767, pump 2525, detector: ZQ mass and UV 2487, solvent system: acetonitrile and 0.1% formic acid in water) afforded 3,3-dimethyl-2-{3-[(4-methyl-piperazine-1-carbonyl)-amino]-phenyl}-1,2,3,4-tetrahydro-quinoline-6-carboxylic acid (90 mg, 22%) as a white solid: LC/MS m/e calcd for C24H30N4O3 (M+H)+: 423.53, observed: 423.2.

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