反应详情

温度

0 °C

To 27.0 g (81.8 mmol) of 2-(2,6-dichloro-4-pyridyl)-6-ethyl-5-methoxycarbonyl5,6-dihydropyrimidin-4-one in 500 mL of dimethylformamide was added at 0° C. over 30 min via a solid addition funnel 19.3 g (172 mmol) of potassium-t-butoxide followed by the dropwise addition over 15 min of 13.3 g (85.2 mmol) of iodoethane. The reaction was stirred at 0° C. for one hour before quenching onto 700 mL of ice water. The aqueous was acidified to pH=1 (conc. HCl) and extracted with EtOAc (3×400 mL). The organics were combined before washing with water (2×500 mL), and saturated NaCl (1×300 mL) drying over MgSO4, filtering and evaporating to dryness in vacuo to give 27.32 g (76.3 mmol, 93%) of the desired product as a pale yellow solid with mp=202°-203° C.

1. custombefore quenching onto 700 mL of ice water
2. extractionextracted with EtOAc (3×400 mL)
3. washbefore washing with water (2×500 mL), and saturated NaCl (1×300 mL)
4. dry with materialdrying over MgSO4
5. filtrationfiltering
6. customevaporating to dryness in vacuo