4-Methylphenylhydrazine monohydrochloride → 3-(1-(Benzyloxy)-2-methylpropan-2-yl)-1-p-tolyl-1H-pyrazol-5-amine

Participants

Reaction Steps

A solution of p-tolylhydrazine hydrochloride (1.99 g, 12.6 mmol) and 5-(benzyloxy)-4,4-dimethyl-3-oxopentanenitrile (4.00 g, 13.8 mmol, 80% purity) in EtOH was heated at reflux for 16 hr and then cooled to RT. The mixture was neutralized with saturated aqueous NaHCO3 solution and extracted with EtOAc. The organic extracts were washed with brine, dried (MgSO4) and evaporated in vacuo. The residue was purified by flash column chromatography (SiO2, 80 g, MeOH in DCM, 0-5%, gradient elution) to afford the title compound, (2.62 g, 60%); Rt 3.05 min (Method 1 basic); m/z 336 (M+H)+ (ES+).

Provenance & Evidence