3-(Trifluoromethyl)benzenesulfonyl chloride → n-(1-Isobutyl-3-oxo-2,3-dihydro-1h-indazol-5-yl)-3-trifluoromethyl-benzenesulfonamide

Participants

Reaction Conditions

Reaction Steps

To a solution of 5-amino-1-isobutyl-1,2-dihydro-indazol-3-one (0.04 g) in pyridine (1 mL) was added 3-trifluoromethylbenzenesulfonylchoride (0.041 g) in one go. The solution was stirred at 60° C. for 24 hours. The pyridine was then removed in vacuo and the residue was dissolved in EtOAc/water and separated. The aqueous phase was extracted a further two times with EtOAc and the combined organic phases were washed with brine and dried over sodium sulfate. The drying agent was removed by filtration and the volatiles were removed in vacuo to afford a crude residue. The crude material was purified via flash column chromatography eluting with EtOAc/nHeptane/1% AcOH) to afford the desired N-(1-isobutyl-3-oxo-2,3-dihydro-1H-indazol-5-yl)-3-trifluoromethyl-benzenesulfonamide (0.015 g) as a pale yellow powder. MS (ESI+): 414.4[M+H]+).

Provenance & Evidence