Dimethylformamide → methyl (3R)-3-methyl-4-((1-methyl-1H-pyrazol-3-yl)amino)-4-oxobutanoate

Participants

Reaction Steps

To a solution of (2R)-4-methoxy-2-methyl-4-oxobutanoic acid (0.30 mL) and DMF (20 μL) in THF (5.0 mL) was added oxalyl chloride (0.25 mL). The reaction mixture was stirred at room temperature for 3 hr, and 1-methyl-1H-pyrazol-3-amine (200 mg) and triethylamine (0.62 mL) were added thereto. The reaction mixture was stirred at room temperature for 15 hr, and extracted with ethyl acetate. The extract was washed with saturated aqueous ammonium chloride solution and saturated brine, and dried over anhydrous sodium sulfate, and the solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/hexane) to give the title compound (345 mg).

Provenance & Evidence