Ammonium Hydroxide → 1-[2-(4-tert-butyl-benzenesulfonylamino)-5-chloro-phenyl]-1H-pyrazole-4-carboxylic acid amide

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Reaction Steps

1-[2-(4-tert-butyl-benzenesulfonylamino)-5-chloro-phenyl]-1H-pyrazole-4-carboxylic acid ethyl ester (synthesized according to general procedure D, 55 mg, 0.119 mmol) and 1 mL of ammonium hydroxide were stirred at 70° C. for 18 hours. The resultant solution was partitioned between saturated sodium bicarbonate and dichloromethane, and the aqueous layer extracted with dichloromethane. The combined organic layers were dried over magnesium sulfate, filtered, and concentrated in vacuo. The crude product was subsequently purified by flash column chromatography (0-100% ethyl acetate in hexanes) to yield 1-[2-(4-tert-butyl-benzenesulfonylamino)-5-chloro-phenyl]-1H-pyrazole-4-carboxylic acid amide: MS (ES) M+H expected 433.1, found 433.0.

Provenance & Evidence