反应详情

5-Benzoyl-6-(bromomethyl)-1,3-dimethylpyrimidine-2,4(1H,3H)-dione (Intermediate C) (1.38 g, 4.09 mmol), ethyl 5-aminovalerate hydrochloride (1.109 g, 6.14 mmol) and triethylamine (1.711 mL, 12.28 mmol) were combined in ethanol (20 mL) and the mixture heated at reflux for 40 mins. The reaction mixture was cooled to room temperature and evaporated under vacuum. The residue was partitioned between water and DCM and the phases separated. The organic phase was passed through a hydrophobic frit and evaporated onto silica. The silica was deposited onto a 25 g silica cartridge and the system eluted with 20% EtOAc/hexane, 40% EtOAc/hexane, 60% EtOAc/hexane and 80% EtOAc/hexane. The product fractions were combined and concentrated under reduced pressure to afford the title compound;

1. temperaturethe mixture heated
2. temperatureat reflux for 40 mins
3. customevaporated under vacuum
4. customThe residue was partitioned between water and DCM
5. customthe phases separated
6. customevaporated onto silica
7. washthe system eluted with 20% EtOAc/hexane, 40% EtOAc/hexane, 60% EtOAc/hexane and 80% EtOAc/hexane
8. concentrationconcentrated under reduced pressure