Dimethylformamide → 3-Bromo-4-trifluoromethyl-6-(4-trifluoromethyl-phenyl)-pyridazine

Participants

Reaction Conditions

Reaction Steps

A mixture of 4-trifluoromethyl-6-(4-trifluoromethyl-phenyl)-2H-pyridazin-3-one (example C.26 step 6) (9.61 g, 31 mmol), POBr3 (26.8 g, 94 mmol) and DMF (0.72 mL, 9 mmol) was stirred for 3 h at 105° C. under nitrogen atmosphere. The reaction mixture was poured (the mixture was nearly solid) onto water (300 mL) and stirred for 2 h at 23° C., the precipitated solid was filtered off and applied onto silica gel for silica gel column chromatography with heptane/EtOAc 4:1→2:1 to give the title compound as a light brown solid (11.22 g, 97%). MS (ISP) 371 [(M+H)+], 373 [(M+2+H)+]; mp 123-125° C.

Provenance & Evidence