反应详情

温度

80 °C

To a solution of ethyl 3-methyl-1H-pyrazole-4-carboxylate (4.7 g, 30.6 mmol) in acetonitrile were added potassium carbonate (10.6 g, 75.0 mmol) and 2,4-dichloro-5-methylpyrimidine (5.0 g, 30.6 mmol) at room temperature. The resulting suspension was heated at 80° C. for 3 hours with monitoring a reaction with LC-MS or thin layer chromatography (TLC). Volatiles were partially removed and the residue was extracted with ethyl acetate. The collected organic layer was washed with brine, dried over anhydrous sodium sulfate and then concentrated in vacuo. The resulting solid was recrystallized in a mixture of heptanes and ethyl acetate to afford the desired intermediate 5 as a pale yellow solid (5.2 g, 61%); MS (ESI) m/z 281 [M+H]+.

1. customa reaction with LC-MS or thin layer chromatography (TLC)
2. customVolatiles were partially removed
3. extractionthe residue was extracted with ethyl acetate
4. washThe collected organic layer was washed with brine
5. dry with materialdried over anhydrous sodium sulfate
6. concentrationconcentrated in vacuo
7. customThe resulting solid was recrystallized in a mixture of heptanes and ethyl acetate