4-tert-butyl-N-[5-chloro-2-(4-nitro-pyrazol-1-yl)-pyridin-3-yl]-benzenesulfonamide → N-[2-(4-amino-pyrazol-1-yl)-5-chloro-pyridin-3-yl]-4-tert-butyl-benzenesulfonamide

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To a solution of 4-tert-butyl-N-[5-chloro-2-(4-nitro-pyrazol-1-yl)-pyridin-3-yl]-benzenesulfonamide (100 mg, 0.229 mmol) in 2 mL of ethanol was added 10% Pd/C and the heterogeneous solution was stirred under an atmosphere of hydrogen. After two hours, the reaction was filtered through celite and concentrated in vacuo. The crude reside was subsequently purified by flash column chromatography (0-100% ethyl acetate in hexanes) to afford N-[2-(4-amino-pyrazol-1-yl)-5-chloro-pyridin-3-yl]-4-tert-butyl-benzene sulfonamide as a white solid: MS (ES) M+H expected 406.1, found 406.0.

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