Lithium hydroxide, monohydrate → 6-(4-{[3,5-Bis(difluoromethyl)-1H-pyrazol-1-yl]acetyl}piperazin-1-yl)pyridine-2-carboxylic acid

Beteiligte Stoffe

Reaktionsschritte

To a solution of ethyl 6-(4-{[3,5-bis(difluoromethyl)-1H-pyrazol-1-yl]acetyl}piperazin-1-yl)pyridine-2-carboxylate (1.3 g) in tetrahydrofuran (20 ml) and water (5 ml) is added, at room temperature, lithium hydroxide monohydrate (185 mg). The mixture is stirred at room temperature for 5 hours, and then ice-cold 1N HCl solution is added. The aqueous phase is extracted with ethyl acetate and then the combined organic phases are dried over sodium sulphate. The solids are filtered off and the solvent is distilled off. This gives 6-(4-{[3,5-bis(difluoromethyl)-1H-pyrazol-1-yl]acetyl}piperidin-1-yl)pyridine-2-carboxylic acid (700 mg).

Herkunft & Nachweise