Sodium Hydroxide → 2-(4-Chloro-3-(cyclohexanecarboxamido)phenyl)-3,3-dimethyl-1,2,3,4-tetrahydroquinoline-6-carboxylic acid

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To a solution of methyl 2-(4-chloro-3-(cyclohexanecarboxamido)phenyl)-3,3-dimethyl-1,2,3,4-tetrahydroquinoline-6-carboxylate (380 mg, 0.835 mmol) in methanol (15 mL) was added a solution of sodium hydroxide (270 mg, 6.68 mmol) in water (6.8 mL). The mixture was stirred and heated to reflux for 5 h. The mixture was evaporated, and the residue was dissolved in 15 mL of water. The aqueous solution was acidified to pH=3 with 1M hydrochloric acid. The precipitated solid was collected by filtration, and dissolved in ethyl acetate. The organic layer was dried over sodium sulfate. After evaporation, the mixture was purified on silica gel to afford 50 mg of 2-(4-chloro-3-(cyclohexanecarboxamido)phenyl)-3,3-dimethyl-1,2,3,4-tetrahydroquinoline-6-carboxylic acid as an off white solid. (Yield: 14%) MS (ESI+APCI) M+1=423.2, M−1=441.0.

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