Pyrazole → 3-Pyrazol-1-ylmethyl-azetidine-1-carboxylic acid tert-butyl ester

Participants

Reaction Steps

To 17.9 mg (0.26 mmol) pyrazole in 2 mL dry THF at 0° C. was added 14 mg (0.35 mmol, 60% dispersion in mineral oil) NaH and the reaction was stirred for 30 minutes. 50 mg (0.17 mmol) 3-methanesulfonyloxymethyl-azetidine-1-carboxylic acid tert-butyl ester in 1 mL dry THF was added dropwise and the reaction was allowed to warm to room temperature for 16 hours. The solvent was evaporated and the remaining residue was partitioned between 25 mL H2O and 25 mL EtOAc. The organic phase was washed with 25 mL 1% citric acid solution, H2O (3×25 mL), 25 mL brine and dried with Na2SO4. After filtration and evaporation of the solvent the product was used in the next step without further purification.

Provenance & Evidence