2-cyclopropylmethyl-6-(3-fluoro-4-methoxyphenyl)-4-meth anesulfonyloxymethyl-2H-pyridazin-3-one → 2-cyclopropylmethyl-6-(3-fluoro-4-methoxyphenyl)-4-methylaminomethyl-2H-pyridazin-3-one

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Reaction Steps

A solution of 2-cyclopropylmethyl-6-(3-fluoro-4-methoxyphenyl)-4-methanesulfonyloxymethyl-2H-pyridazin-3-one (160 mg, 0.42 mmol) in 30% methylamine/ethanol (5 mL) was stirred at 80° C. for 4 hours in a sealed tube. The solvent was distilled off under reduced pressure, and the residue was purified by preparative thin-layer chromatography on silica gel [developing solvent: chloroform/methanol (10/1)] to yield title compound as a slightly yellow oil (87 mg, 65.5%).

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