Triethylamine → 1-(2-Fluorophenyl)-5-iodo-1H-pyrazol-3-ylamine

Participants

Reaction Conditions

Reaction Steps

To a solution of 3-(2,5-dimethylpyrrol-1-yl)-1-(2-fluorophenyl)-5-iodo-1H-pyrazole (1.23 g) in ethanol/water (2/1, 18 ml) were sequentially added hydroxylammonium chloride (4.47 g) and triethylamine (0.9 ml) at room temperature, and the mixture was stirred at 90° C. for 24 hours. This reaction mixture was cooled to room temperature, concentrated under reduced pressure. To the resulting residue was added a 8M aqueous solution of sodium hydroxide, and then the mixture was extracted with ethyl acetate. This organic layer was washed with a saturated aqueous solution of sodium chloride, dried over anhydrous sodium sulfate, and then concentrated under reduced pressure. The resulting residue was purified by silica gel column chromatography (eluent: n-hexane/ethyl acetate=4/1 to 1/1) to give the titled compound (0.61 g).

Provenance & Evidence