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

Participants

Reaction Conditions

Reaction Steps

1-[5-(4-tert-Butylphenyl)-4-hydroxy-1-methyl-1H-pyrazol-3-yl]ethanone (0.578 mmol, 157.5 mg) synthesized in Synthetic Example 3, methyl 4-hydrazinocarbonyl-2-hydroxybenzoate (0.578 mmol, 121.6 mg) synthesized in Reference Synthetic Example 43 and p-tosylic acid monohydride (30 mol %, 30 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 (216.6 mg, yield 81%).

Provenance & Evidence