Hydrochloric Acid → HCID 136169378, compound

Participants

Reaction Steps

4-[1-(3,4-Dichloro-phenyl)-5-oxo-4,5-dihydro-1H-[1,2,4]triazol-3-yl]-benzonitrile. A suspension of 4-cyanophenyl-oxo-acetic acid (100 mg, 0.571 mmol), (3,4-dichlorophenyl)hydrazine hydrochloride (122 mg, 0.571 mmol), 12.1 N HCl (5 uL, 0.057 mmol), and H2O (˜10 mL) in a 25 mL reaction vial was stirred vigorously at ambient temperature for 24 h. The hydrazone was obtained by vacuum filtration and placed into a 100 mL round bottom flask with a magnetic stir bar. The flask was then supplemented with triethylamine (0.08 mL, 0.571 mmol), diphenylphosphoryl azide (157 mg, 0.571 mmol), and toluene (20 mL) before heating at 110° C. for 1 h. Upon cooling the contents were quenched with 10% NaOH (aq) and made acidic (pH 1) with conc. HCl. Precipitation was allowed for 15 min before the intermediate was obtained by vacuum filtration and dried overnight in a 45° C. vacuum oven (16 mg, 8%). The nitrile was reduced to the aldehyde using DIBAL under conditions previously described.

Provenance & Evidence