Sodium Hydroxide → HCID 28606431, compound

Participants

Reaction Steps

Ethyl 1-(4-bromophenyl)-5-cyclopropyl-pyrazole-4-carboxylate (Intermediate #31) (423 mg, 1.29 mmol) was dissolved in methanol (20 mL) and treated with 2M aqueous sodium hydroxide solution (3.23 mL, 6.46 mmol). The mixture was stirred at ambient temperature for 24 h and then the methanol was removed by evaporation under reduced pressure. The residue was dissolved in water (50 mL), acidified to pH4 with 2M HCl and extracted with EtOAc (3×25 mL). The combined extracts were washed with water and brine, dried (MgSO4) and evaporated to leave 1-(4-bromophenyl)-5-cyclopropyl-pyrazole-4-carboxylic acid a white solid. (343 mg, 87%).

Provenance & Evidence