6-[(2-Fluorophenyl)methyl]-3(2H)-pyridazinone → 6-[3-(2,4,6-trichlorobenzoyl)-6-fluorobenzyl)-2H-pyridazin-3-one

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Reaction Steps

AlCl3 (1.75 g, 13.1 mmol) was added to a solution of 6-(2-fluorobenzyl)-2H-pyridazin-3-one (0.9 g, 4.4 mmol) [prepared as described above] in methylene chloride (20 ml) at ambient temperature and under a nitrogen atmosphere. 2,4,6-trichlorobenzoyl chloride [(1.98 g, 8.78 mmol) prepared from the corresponding acid by treatment with oxalyl chloride/ methylene chloride with a trace of DMF] was added to the slurry. After stirring overnight, the reaction was quenched with ice. The product was extracted into ethyl acetate, and dried over MgSO4. The solvent was removed in vacuo and the crude product was chromatographed on a silica gel column (ether) to give impure 6-[3-(2,4,6-trichlorobenzoyl)-6-fluorobenzyl)-2H-pyridazin-3-one (0.43 g). Recrystallization from acetone/hexanes mixture gave pure 6-[3-(2,4,6-trichlorobenzoyl)-6-fluorobenzyl)-2H-pyridazin-3-one (0.34 g, 18% yield) as a solid, mp 185.0°-185.3° C.

Provenance & Evidence