Triethylamine → 1,5-Bis(2-trimethylsilylethoxymethyl)-3-trimethylsilylethynyl-1,5-dihydropyrrolo[2,3-d]pyridazin-4-one

Participants

Reaction Conditions

Reaction Steps

To 50 ml of tetrahydrofuran solution containing 16.6 g (purity: 78.4%, 25.0 mmol) of 3-iodo-1,5-bis(2-trimethylsilylethoxymethyl)-1,5-dihydropyrrolo[2,3-d]pyridazin-4-one obtained in Reference example 18-(b) were added 880 mg (1.25 mmol) of bis(triphenylphosphine)palladium dichloride, 620 mg (3.25 mmol) of cuprous iodide, 1.31 g (5.00 mmol) of triphenylphosphine and 10.5 ml (75.3 mmol) of triethylamine, and the mixture was degassed under reduced pressure and replaced with argon. Then, 11 ml of trimethylsilylacetylene was added to the mixture, and the mixture was stirred at 60° C. for 24 hours. After completion of the reaction, water was added to the reaction mixture, and the mixture was extracted with toluene. The organic layer after separation was washed successively with a saturated aqueous solution of ammonium chloride and a saturated aqueous solution of sodium chloride, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The obtained residue was applied to silica gel column chromatography (Eluent; hexane:ethyl acetate=9:1→4:1 (V/V)), and the fractions containing the desired compound were concentrated under reduced pressure to obtain 10.8 g of the title compound as a yellowish solid. (Yield: 88%)

Provenance & Evidence