Water → tert-butyl (3R,4R)-4-(6-carbamoyl-5-(6-methylpyridin-2-ylamino)pyridazin-3-ylamino)tetrahydro-2H-pyran-3-ylcarbamate

関与物質

反応条件

反応手順

6-Chloro-4-(6-methyl-pyridin-2-ylamino)-pyridazine-3-carboxylic acid amide (150 mg, 0.57 mmol) and tert-butyl (3R,4R)-4-aminotetrahydro-2H-pyran-3-ylcarbamate (185 mg, 0.85 mmol) were dissolved in 1,4-dioxane (2.8 mL) and N,N-diisopropylethylamine (0.25 mL, 1.4 mmol). The reaction mixture was stirred at 150° C. for 4 d. Further tert-butyl (3R,4R)-4-aminotetrahydro-2H-pyran-3-ylcarbamate (50 mg, 0.23 mmol) and N,N-diisopropylethylamine (0.04 mL, 0.23 mmol) was added in four portions (every 36 h for 144 h). The mixture was cooled, and then water and ethyl acetate were added. The aqueous layer was extracted with ethyl acetate, and the combined organic layers were washed with sodium chloride solution and dried over sodium sulfate. After concentration, the residue was purified by chromatography (silica, 0 to 7% methanol in dichloromethane) to give {(3R,4R)-4-[6-carbamoyl-5-(6-methyl-pyridin-2-ylamino)-pyridazin-3-ylamino]-tetrahydro-pyran-3-yl}-carbamic acid tert-butyl ester (60 mg, 18%) as a clear amorphous residue. This was 83% pure and was used directly without further purification. MS (EI/CI) m/z: 444 [M+H].

情報源と証拠