Ethyl benzoylacetate → 1-(2-methyl-1-phenylpropan-2-yl)-3-phenyl-1H-pyrazol-5(4H)-one

Participants

Reaction Conditions

Reaction Steps

500 mg (2.45 mmol) of 1-(2-methyl-1-phenylpropan-2-yl)-2-(propan-2-ylidene)hydrazine was dissolved in 3.0 mL of glacial acetic acid, mixed with 429 mg (2.23 mmol) of ethyl 3-oxo-3-phenylpropanoate and stirred at 100° C. for 4 hours. The reaction solution was cooled to room temperature, diluted with ethyl acetate, neutralized with saturated aqueous sodium hydrogen carbonate (100 ml) and extracted with ethyl acetate. The resulting organic layer was dried over anhydrous sodium sulfate and filtered, and the filtrate was concentrated under reduced pressure. The resulting residue was purified by silica gel column chromatography using hexane-ethyl acetate (100:1 to 9:1) as the eluent to give 330 mg of the desired product as a pale orange solid.

Provenance & Evidence