Triethylamine → 5-Amino-1-cyclohexyl-1H-pyrazole-4-carbonitrile

Participants

Reaction Steps

First ethoxymethylenemalononitrile (2.43 g, 19.9 mmol) and then 8 ml of triethylamine are added to a solution of cyclohexylhydrazine hydrochloride (3 g, 19.9 mmol) in 36 ml of ethanol at room temperature. The mixture is refluxed for 20 min and then cooled. The solvent is stripped off in a rotary evaporator, and the residue is taken up in DCM, washed with aqueous sodium bicarbonate solution, dried over sodium sulfate, filtered and concentrated in vacuo. The crude product is chromatographed on silica gel (mobile phase: dichloromethane/methanol 0-10%).

Provenance & Evidence