Methanol → 1-Benzyloxymethyl-5-(2-trimethylsilylethoxymethyl)-1,5-dihydropyrrolo[2,3-d]pyridazin-4-one

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Reaction Steps

To 5.00 g (10.8 mmol) of 1-benzyloxymethyl-2-bromo-5-(2-trimethylsilylethoxymethyl)-1,5-dihydropyrrolo[2,3-d]-pyridazin-4-one obtained in Reference example 33-(a) were added 50 ml of methanol, 30 ml of toluene, 1.5 g of potassium carbonate and 2.5 g of 51 palladium-active carbon, and the mixture was stirred under 1 atm hydrogen atmosphere at room temperature for 3 hours. After completion of the reaction, insoluble material of the reaction suspension was removed by filtration, and the filtrate was concentrated under reduced pressure. The obtained residue was applied to silica gel column chromatography (Eluent; toluene:ethyl acetate=1:1 (V/V)), and the fractions containing the desired compound were concentrated under reduced pressure to obtain 8.15 g of the title compound as a pale yellowish solid. (Yield: 77%)

Provenance & Evidence