Triethylamine → 1-(Methoxycarbonyl)-2-(2,4,5-trifluorophenyl)piperidine-4-carboxylic acid

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Reaction Steps

Dimethyl 2-(2,4,5-trifluorophenyl)piperidine-1,4-dicarboxylate (2.971 g, 8.97 mmol) was dissolved in acetonitrile (30 mL) and water (0.600 mL), then lithium bromide (6.23 g, 71.74 mmol) was added. Triethylamine (4.97 mL, 35.87 mmol) was added and the resulting brown suspension was heated under reflux. Water and MTBE were added. The organic phase was extracted with water (×2). The pooled aqueous layer was acidified to pH 1 with 3.8 M HCl and then extracted with MTBE (×2). The combined organic layer was washed with water and evaporated. Traces of water were azeotropically removed by MeCN. 1-(Methoxycarbonyl)-2-(2,4,5-trifluorophenyl)piperidine-4-carboxylic acid (2.388 g, 84%) was isolated as a yellow oil. MS m/z 318 (M+H)+

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