反应详情

温度

90 °C

To a crude mixture of ethyl 4-(benzoylamino)-3-oxopentanoate (0.6 g, 2.28 mmol) in DMF (4 mL) at rt, was added POCl3 (1.04 g, 6.84 mmol). The resulting solution was heated at 90° C. for 1 hour, then cooled down to rt, and poured into ice for 30 minutes. The aqueous solution was carefully added to a saturated aqueous solution of NaHCO3. Phases were separated with EtOAc and the combined organic extracts were dried over MgSO4 and solvent removed under reduced pressure. The crude material was purified on Biotage small column using a solvent gradient of 0 to 50% EtOAc/Hexane. This gave ethyl(4-methyl-2-phenyl-1,3-oxazol-5-yl)acetate (0.269 g 48% yield) as yellowish oil. ES-MS m/z 246.2 ((MH)+); HPLC RT (min.) 2.77; 1H NMR (CDCl3) δ 8.01-7.98 (m, 2H), 7.45-7.41 (m, 3H), 4.20 (q, 2H), 3.71 (s, 2H), 2.21 (s, 3H), 1.28 (t, 3H).

1. temperaturecooled down to rt
2. additionpoured into ice for 30 minutes
3. customPhases were separated with EtOAc
4. dry with materialthe combined organic extracts were dried over MgSO4 and solvent
5. customremoved under reduced pressure
6. customThe crude material was purified on Biotage small column