Water → 5-(3-bromophenyl)-1-(2-((trimethylsilyl)methoxy)ethyl)-1H-pyrazol-4-amine

Participants

Reaction Conditions

Reaction Steps

To a solution of 5-(3-bromophenyl)-4-nitro-1-(2-((trimethylsilyl)methoxy)ethyl)-1H-pyrazole (800 mg, 2.4 mmol) in 25 mL ethanol was added 50 mL of water, ammonium chloride (636 mg, 12 mmol), and iron powder (806 mg, 14 mmol). The reaction mixture was stirred at 75° C. for 6 hours. After cooling to room temperature, the reaction was diluted with dichloromethane and filtered through a celite pad, rinsing with more dichloromethane. The filtrate was added to 150 mL of saturated aqueous sodium bicarbonate and extracted twice with dichloromethane. The combined organic extracts were dried over magnesium sulfate and concentrated to yield 530 mg (71%) of 5-(3-bromophenyl)-1-(2-((trimethylsilyl)methoxy)ethyl)-1H-pyrazol-4-amine, which was carried forward without purification. LCMS (ESI) m+H=368.0.

Provenance & Evidence