Water → 5-hydroxy-1-methyl-3-(1-phenyl-1H-pyrazol-5-yl)pyridazin-4(1H)-one

Participants

Reaction Steps

To a solution of sodium iodide (3.75 g) in acetonitrile (150 mL) was added chlorotrimethylsilane (3.17 mL) with stirring at room temperature, and the mixture was stirred for min. Then, 5-methoxy-1-methyl-3-(1-phenyl-1H-pyrazol-5-yl)pyridazin-4(1H)-one (1.41 g) was added, and the mixture was stirred for 30 min at the same temperature, and further refluxed for 3 hr. The reaction mixture was allowed to cool to room temperature, poured into water and the mixture was stirred for 30 min. The mixture was extracted with ethyl acetate, and the organic layer was washed successively with aqueous sodium thiosulfate solution and saturated brine, dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The obtained residue was triturated with ethyl acetate-diisopropyl ether, collected by filtration, and dried to give the title compound (1.032 g) as white needles.

Provenance & Evidence