2-(3,4-Dichlorophenyl)-2-oxoacetaldehyde → 1-[5-(3,4-dichlorophenyl)-4-hydroxy-1-methyl-1H-pyrazol-3-yl]ethanone

Participants

Reaction Conditions

Reaction Steps

2-Oxopropanal methylhydrazone (1.525 mmol, 152.7 mg) synthesized in Reference Synthetic Example 1 and (3,4-dichlorophenyl)(oxo)acetaldehyde (1.525 mmol, 310 mg) synthesized in Reference Synthetic Example 3 were dissolved in acetic acid (10 mL) and stirred at 110° C. for 1.5 hours. Then, the solvent was evaporated, and the residue was dried by means of a vacuum pump, resolved by silica gel thin layer chromatography (n-hexane/AcOEt=3/2) and purified by silica gel thin layer chromatography (n-hexane/AcOEt=2/1) to give the desired product as a yellow solid (57.8 mg, yield 13%).

Provenance & Evidence