Trifluoroacetic acid → 1-[2-fluoro-4-(1H-pyrazol-1-yl)phenyl]-5-methoxy-3-[1-(2,2,2-trifluoroethyl)-1H-pyrazol-5-yl]pyridazin-4(1H)-one

Participants

Reaction Steps

To a suspension of 3-[3-(dimethylamino)prop-2-enoyl]-5-methoxy-1-[2-fluoro-4-(1H-pyrazol-1-yl)phenyl]pyridazin-4(1H)-one (200 mg) in ethanol (2.0 mL) was added dropwise a solution of 2,2,2-trifluoroethylhydrazine (0.0483 mL) and TFA (0.2 mL) in ethanol (2.0 mL), and the mixture was stirred at room temperature for 48 hr. The reaction mixture was concentrated under reduced pressure, and the residue was purified by silica gel column chromatography (ethyl acetate/hexane) to give the title compound (170 mg).

Provenance & Evidence