反应详情

A mixture of 5-(trifluoromethyl)-1H-pyrazol-3-amine (500 mg, 3.3 mmol), 2,4,5-trichloropyrimidine (607 mg, 3.3 mmol) and sodium carbonate (525 mg, 5 mmol) in anhydrous EtOH (10 mL) was stirred at rt. After one day, LCMS showed the reaction was not complete. Additional 2,4,5-trichloropyrimidine (0.15 mL) and sodium carbonate (525 mg) were added and the reaction continued for two more days. The solvent was evaporated, and the residue was extracted with DCM (3×20 mL). The combined DCM layers were washed with brine (10 mL), dried over Na2SO4 and evaporated. The crude product was purified by silica chromatography (0-50% EtOAc in hexanes gradient) to give 2,5-Dichloro-N-(5-(trifluoromethyl)-1H-pyrazol-3-yl)pyrimidin-4-amine as a light tan colored solid; ESMS m/z 297.9 (M+H+).

1. customThe solvent was evaporated
2. extractionthe residue was extracted with DCM (3×20 mL)
3. washThe combined DCM layers were washed with brine (10 mL)
4. dry with materialdried over Na2SO4
5. customevaporated
6. customThe crude product was purified by silica chromatography (0-50% EtOAc in hexanes gradient)