Trifluoroacetic acid → 5-Cyclopentylsulfanyl-1-(4-methoxycarbonylphenyl)pyrazole-4-carboxylic acid

Participants

Reaction Conditions

Reaction Steps

Trifluoroacetic acid (2.63 mL, 34.29 mmol) was added to tert-butyl 5-(cyclopentylthio)-1-(4-(methoxycarbonyl)phenyl)-1H-pyrazole-4-carboxylate (Intermediate #94) (1.38 g, 3.43 mmol) in CH2Cl2 (25 mL) The resulting solution was stirred at 20° C. for 24 hours. The reaction mixture was evaporated to dryness, re-dissolved in dioxan (20 mL) and re-evaporated to dryness to afford 5-(cyclopentylthio)-1-(4-(methoxycarbonyl)phenyl)-1H-pyrazole-4-carboxylic acid (1.180 g, 99%) as a white to crystalline solid.

Provenance & Evidence