Water → HCID 66926158, compound

Participants

Reaction Steps

3-(4-Chloro-phenyl)-5-methyl-1H-pyrazole (1.84 g, 9.6 mmol) was dissolved in dimethylformamide (20 ml) followed by the addition of sodium hydride (60% dispersion in oil, 384 mg, 9.6 mmol). The reaction was stirred at room temperature for 15 min, followed by the addition of 5-bromo-4-oxo-pentanoic acid methyl ester (2 g, 9.6 mmol). The reaction was stirred at room temperature for a further 30 min, before the addition of water (200 ml). The solution was then extracted with ethyl acetate (2×150 ml). The organics were dried over magnesium sulfate and concentrated in vacuo. The crude product was then purified by column chromatography (120g column, DCM to 90% DCM/EtOAc over 50 mins) to give 5-[3-(4-chloro-phenyl)-5-methyl-pyrazol-1-yl]-4-oxo-pentanoic acid methyl ester (1.84 g).

Provenance & Evidence