反应详情

To a solution of 4-methyl-1H-imidazole-5-carbaldehyde (5.0 g, 45.4 mmol) in anhydrous THF (50 mL) was added diaza(1,3)bicyclo[5.4.0]undecane (DBU, 6.8 mL, 45.4 mmol) and iodoethane (3.4 mL, 45.4 mmol). The reaction mixture was stirred at room temperature overnight. Water (50 mL) was added before THF was evaporated. The mixture was extracted with EtOAc (1×50 mL) and 2-butanol (2×50 mL). The organic extracts were combined, dried over MgSO4, filtered, evaporated, and dried in vacuo. The crude product was purified by flash chromatography (0-1% MeOH/DCM), affording 1-ethyl-5-methyl-1H-imidazole-4-carbaldehyde (730 mg, 12% yield).

1. customwas evaporated
2. extractionThe mixture was extracted with EtOAc (1×50 mL) and 2-butanol (2×50 mL)
3. dry with materialdried over MgSO4
4. filtrationfiltered
5. customevaporated
6. customdried in vacuo
7. customThe crude product was purified by flash chromatography (0-1% MeOH/DCM)