反应详情

温度

80 °C

7-(2-Chloro-4-methoxyphenyl)-2-ethyl-3-nitropyrazolo[1,5-a]pyridine (5 mg) was suspended in ethanol (2 mL), and then water (1 mL), acetic acid (0.5 mL) and zinc powder (10 mg) were added and the mixture was heated and stirred at 80° C. for 30 minutes. The reaction mixture was filtered, water was added to the filtrate, extraction was performed with ethyl acetate and the extract washed with saturated aqueous sodium hydrogencarbonate and brine. After drying over anhydrous magnesium sulfate and filtration, the solvent was concentrated under reduced pressure to obtain [7-(2-chloro-4-methoxyphenyl)-2-ethylpyrazolo[1,5-a]pyridin-3-yl]amine as crude crystals. These were dissolved in tetrahydrofuran (1 mL) without further purification, and after adding propionaldehyde (0.015 mL) and 3 M aqueous sulfuric acid (0.071 mL), sodium borohydride (5.4 mg) was added in five portions while vigorously stirring on ice, and stirring was continued for 30 minutes. Water was added to the reaction mixture, extraction was performed with diethyl ether and the extract washed with saturated sodium hydrogencarbonate and brine. After drying over anhydrous magnesium sulfate and filtration, the solvent was concentrated under reduced pressure and the residue was purified by preparative TLC [n-hexane:ethyl acetate (5:1), Rf=0.5] to obtain the title compound (6 mg) as a light yellow oil.

1. temperaturethe mixture was heated
2. filtrationThe reaction mixture was filtered
3. additionwater was added to the filtrate, extraction
4. washthe extract washed with saturated aqueous sodium hydrogencarbonate and brine
5. dry with materialAfter drying over anhydrous magnesium sulfate and filtration
6. concentrationthe solvent was concentrated under reduced pressure