反应详情

To a solution of ethyl 1-(pyridin-2-yl)-5-(trifluoromethyl)-1H-pyrazole-4-carboxylate (8.7 g, 30.5 mmol) in ethanol (2 mL) was added 3 N NaOH (30.5 mL, 92 mmol). After the reaction was stirred at room temperature for 1 hour, the solvents were evaporated and 3N aq. HCl was added. The resulting solids were collected by filtration to afford 1-(pyridin-2-yl)-5-(trifluoromethyl)-1H-pyrazole-4-carboxylic acid (5.58 g, 21.7 mmol). The compound had an HPLC retention time=2.0 min. —Column: PHENOMENEX® Luna 5u C18 4.6×30 mm (2 min.); Solvent A=10% MeOH, 90% H2O, 0.1% TFA; Solvent B=90% MeOH, 10% H2O, 0.1% TFA. LC/MS M+1=258.1.

1. customthe solvents were evaporated
2. addition3N aq. HCl was added
3. filtrationThe resulting solids were collected by filtration