反应详情

Cyclopropanecarboxyaldehyde (0.047 mL) and 3 M sulfuric acid (0.21 mL) were added to a solution of 2-[7-(2-methoxy-4,6-dimethylphenyl)-2-(methylsulfanyl)pyrazolo[1,5-a]pyridin-3-yl]amino-1-methylethyl benzoate (100 mg) in tetrahydrofuran (0.7 mL) while cooling on ice, and then sodium borohydride (16 mg) was slowly added thereto at the same temperature. The mixture was stirred for 30 minutes at room temperature, and then 5 N aqueous sodium hydroxide (0.3 mL) was added while cooling on ice to make the reaction mixture basic. Methanol (2.1 mL) was added to the reaction mixture, and after heating to reflux for 1 hour, it was returned to room temperature, extraction was performed with ethyl acetate, and the extract washed with brine, dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate:n-hexane=1:5) to obtain the title compound (80 mg) as a yellow oil.

1. temperaturewhile cooling on ice
2. temperaturewhile cooling on ice
3. temperatureafter heating
4. temperatureto reflux for 1 hour
5. customwas returned to room temperature
6. extractionextraction
7. washthe extract washed with brine
8. dry with materialdried over anhydrous magnesium sulfate
9. concentrationconcentrated under reduced pressure
10. customThe residue was purified by silica gel column chromatography (ethyl acetate:n-hexane=1:5)