反应详情

To a N,N-dimethylformamide (6 mL) solution of 3-[2,6-dimethoxy-4-(methoxymethyl)phenyl]-6-methoxypyrazolo[5,1-b][1,3]thiazole-7-amine (400 mg, 1.14 mmol) were added 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (0.236 mL, 1.33 mmol) and 1-hydroxybenzotriazole (180 mg, 1.33 mmol), and the mixture was stirred at room temperature over one day and night. Water was added to the reaction mixture, and the reaction mixture was extracted with ethyl acetate and dried over anhydrous magnesium sulfate. The mixture was filtered, and then the solvent in the filtrate was distilled off under reduced pressure. The residue was purified by silica gel column chromatography (a mixed solvent of n-heptane and ethyl acetate: n-heptane/ethyl acetate=1/1 then 1/2) to obtain the title compound (404 mg, 0.93 mmol).

1. extractionthe reaction mixture was extracted with ethyl acetate
2. dry with materialdried over anhydrous magnesium sulfate
3. filtrationThe mixture was filtered
4. distillationthe solvent in the filtrate was distilled off under reduced pressure
5. customThe residue was purified by silica gel column chromatography (a mixed solvent of n-heptane and ethyl acetate