1-[5-(4-t-Butylphenyl)-4-hydroxy-1-methyl-1H-pyrazol-3-yl]ethanone → methyl 2-bromo-4-[(2-{1-[5-(4-tert-butylphenyl)-4-hydroxy-1-methyl-1H-pyrazol-3-yl]ethylidene}hydrazino)carbonyl]benzoate

Participants

Reaction Conditions

Reaction Steps

1-[5-(4-tert-Butylphenyl)-4-hydroxy-1-methyl-1H-pyrazol-3-yl]ethanone (0.554 mmol, 150.9 mg) synthesized in Synthetic Example 3, methyl 2-bromo-4-hydrazinocarbonylbenzoate (0.554 mmol, 150.8 mg) synthesized in Reference Synthetic Example 42 and p-tosylic acid monohydride (30 mol %, 28.6 mg) were dissolved in isopropyl alcohol (15 mL) and stirred under heating with reflux for 8 hours, and the reactor was cooled to 0° C. The reaction solution was filtered and dried by means of a vacuum pump to give the desired product as a white solid (252.3 mg, yield 86%).

Provenance & Evidence