Sodium Hydroxide → 5-[2-((S)-2-(Cyclopropylmethyl-carbamoyl)-pyrrolidin-1-yl)-2-oxo-ethoxy]-1-phenyl-1H-pyrazole-3-carboxylic acid

Participants

Reaction Steps

To a solution of 1.45 g 5-[2-((S)-2-(Cyclopropylmethyl-carbamoyl)-pyrrolidin-1-yl)-2-oxo-ethoxy]-1-phenyl-1H-pyrazole-3-carboxylic acid ethyl ester in 18 ml THF and 5 ml water were added 2.3 ml aqueous NaOH (2 M) portionwise at 0° C. After 12 h the solution was neutralized with Amberlite IR-120 ion exchange resin, filtered and washed with methanol. The crude product obtained after evaporation of the solvents was used in the subsequent reaction. Yield: 1.50 g.

Provenance & Evidence