2-Methylimidazole → 4-chloro-2-methyl-5-(2-methyl-imidazol-1-yl)-2H-pyridazin-3-one

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Reaction Steps

A solution of 10.0 g (54.2 mmol) of 4,5-Dichloro-2-methyl-2H-pyridazin-3-one (CAS: [933-76-6]) and 8.90 g (108.4 mmol) of 2-methylimidazole in 50 ml of dioxane was stirred for 16 h at 100° C. The solution was concentrated in vaccuo and the residue was purified by flash chromatography over silicagel using a 95:5 mixture of methylene chloride and methanol as eluant to yield 3.33 g (14.82 mmol, 27%) of the title compound as a white crystalline solid, MS: m/e=225.1, 227.1 (M+H+).

Provenance & Evidence