Sulfuric Acid → 5-chloro-1-(3-(trifluoromethyl)benzyl)-1H-indazol-4-amine

Participants

Reaction Steps

A solution of 1-(3-(trifluoromethyl)benzyl)-1H-indazol-4-amine (0.056 g, 0.192 mmol) in THF (1.0 mL) was cooled to −78° C. under N2. H2SO4 (0.00512 mL, 0.0961 mmol) was added and the mixture was stirred for 5 minutes. N-chlorosuccinimide (0.0257 g, 0.192 mmol) was added in one portion and the reaction was stirred at −78° C. for 1 hour. Sodium carbonate (0.0204 g, 0.192 mmol) was added and the mixture was warmed to ambient temperature. The mixture was diluted with water (5 mL) and extracted with EtOAc (3×10 mL). The combined organic layers were then washed with brine and dried over Na2SO4, filtered and concentrated. The crude product was purified by preparative TLC (40% EtOAc/hexane) in which two major bands were observed. The higher band was determined to be the title compound (0.028 g, 44%) and was isolated as a dark yellow/green solid.

Provenance & Evidence