反应详情

温度

5 °C

In a 2 L flask, 48 g of veratrole was dissolved in 200 g of toluene and 138 g of butyl lithium solution (15% in hexane) were added at temperatures from 4° C. to 6° C. The mixture was stirred for one hour at about 5° C. and 3 hours at ambient temperature. Then 26.7 g of 4-pyridinecarboxaldehyde (9) in 120 g of toluene was added at around ambient temperature. The reaction mixture was stirred for about 4.5 hours. The mixture was then cooled to around 5° C. and quenched with 133 mL of water. The mixture was then heated to around 80° C. The organic layer was separated, washed with 67 mL of water and separated. The residual water was removed by azeotropic distillation. The solution was then cooled to −15° C. to −5° C. The product was collected by filtration and washed with 27 g of cold toluene. The yield was 50 g of 4-[1-hydroxy-1-(2,3-dimethoxyphenyl)methyl]pyridine (10) (81% yield).

1. stirringThe reaction mixture was stirred for about 4.5 hours
2. temperatureThe mixture was then cooled to around 5° C.
3. customquenched with 133 mL of water
4. temperatureThe mixture was then heated to around 80° C
5. customThe organic layer was separated
6. washwashed with 67 mL of water
7. customseparated
8. customThe residual water was removed by azeotropic distillation
9. temperatureThe solution was then cooled to −15° C. to −5° C
10. filtrationThe product was collected by filtration
11. washwashed with 27 g of cold toluene