1,2-Dichloroethane → 1,1-dimethylethyl (3R)-3-(cyclopentylmethyl)-4-[5-(4-morpholinylcarbonyl)-4,5-dihydro-1H-pyrazol-1-yl]-4-oxobutanoate

Participants

Reaction Steps

To a solution of 1-{(2R)-2-(cyclopentylmethyl)-4-[(1,1-dimethylethyl)oxy]-4-oxobutanoyl}-4,5-dihydro-1H-pyrazole-5-carboxylic acid (353 mg, 1.0 mmol), Hunig's base (0.35 ml, 2.0 mmol), EDC (231 mg, 1.2 mmol) and aza-HOBt (136 mg, 1.0 mmol) in dichloromethane (DCM) (10 ml) was added morpholine (0.131 ml, 1.5 mmol). The reaction mixture was stirred at room temperature overnight. After this time, the mixture was washed with water (5 mL) and NaHCO3 solution (5 mL×3), and concentrated to provide the crude product which was purified by Combiflash automated silica gel chromatography (0-100% EtOAc in hex) to afford 1,1-dimethylethyl (3R)-3-(cyclopentylmethyl)-4-[5-(4-morpholinylcarbonyl)-4,5-dihydro-1H-pyrazol-1-yl]-4-oxobutanoate (244 mg, 0.58 mmol, 58% yield) as a white solid. MS: 422 ([M+H]+).

Provenance & Evidence