反应详情

To a solution of ethyl 4-pyridinecarboxylate (30 g, 198 mmol) and acetone (34.58 g, 595 mmol) in THF (150 mL) was slowly added NaOMe (12.87 g, 238 mmol) at 35-40° C. The mixture was stirred at room temperature for 0.5 h, and then heated at reflux for 3 h. The mixture was cooled to room temperature and filtered to give a solid, which was washed with t-BuOMe, and dissolved in H2O. The solution was acidified with acetic acid and the resulting oily product was extracted with CHCl3. The solvent was removed in vacuo, and the crude product was obtained (12 g, 37%) and used without further purification. 1H NMR (400 MHz, DMSO-d6) δ 8.73 (d, 2H), 7.76 (d, 2H), 6.63 (s, 1H), 2.21 (s, 3H); note: enolic OH does not appear.

1. customat 35-40° C
2. temperatureheated
3. temperatureat reflux for 3 h
4. temperatureThe mixture was cooled to room temperature
5. filtrationfiltered
6. customto give a solid, which
7. washwas washed with t-BuOMe
8. dissolutiondissolved in H2O
9. extractionthe resulting oily product was extracted with CHCl3
10. customThe solvent was removed in vacuo