Phenylhydrazine → 1-phenyl-3-(thiophen-2-yl)-1H-pyrazol-5-amine

Participants

Reaction Conditions

Reaction Steps

Phenyl hydrazine (143 mg, 1.32 mmol) and 3-oxo-3-(2-thienyl)propionitrile (200 mg, 1.32 mmol) were placed in a microwave vial and dissolved in methanol (660 μL). The vial was sealed, placed in a microwave oven and heated at 120° C. for 40 minutes. After this period, the reaction mixture was concentrated to dryness in vacuo. The residue was redissolved in ethyl acetate and the organic solution washed with water, saturated aqueous NaHCO3 and brine, respectively. The organic layer was dried over anhydrous Na2SO4 and concentrated. The crude material was purified by flash chromatography (20-50% ethyl acetate/hexanes gradient) to afford the desired intermediate, 2-phenyl-5-thiophen-2-yl-2H-pyrazol-3-ylamine (315 mg).

Provenance & Evidence