Sodium Hydroxide → HCID 70664843, compound

Participants

Reaction Steps

700 mg (3.0 mmol) of 5-Amino-1-phenyl-1H-pyrazole-3-carboxylic acid ethyl ester are dissolved in 20 ml of dioxane and added to a suspension of NaH (266 mg 60% suspension in mineral oil, 6.66 mmol) in 10 ml of dioxane. After stirring for 10 minutes at RT 4-bromobutyryl chloride (617.5 mg, 3.3 mmol) is added and the resulting mixture is stirred overnight at RT. A MeOH/H2O mixture (10 ml, 1:1) is added to destroy excess NaH and the solvent is removed in vacuo. The crude product is redissolved in 15 ml of EtOH and 8 mmol of 1M NaOH is added and the mixture is stirred overnight. The solvent is removed in vacuo and the residue subjected to HPLC chromatography: Yield: 554 mg, 68%

Provenance & Evidence