反应详情

A solution of 2,3-bis(4-methoxyphenyl)thiophene (4.4 g, 15 mmole) in 100 ml of toluene was dried by distilling off 75 ml of toluene. The solution was diluted with 150 ml of diethyl ether, cooled to 0°, and treated dropwise with 1.6M n-butyl lithium (13.5 ml, 1.4 equiv.). The reaction mixture was heated at reflux for 1.5 hours, cooled to 5°, treated with a solution of methyl iodide (2 ml, 2.1 equiv.) in 10 ml of diethyl ether, and then heated at reflux for an additional 2.5 hours. The cooled reaction mixture was poured into water and extracted with ethyl acetate. The organic extracts were washed with 1N HCl and brine, dried, and concentrated in vacuo. Recrystallization from ethanol provided the title compound (3 g, 64%), m.p. 93°-97°. Proton nuclear magnetic resonance (NMR) was consistent with the assigned structure.

1. distillationby distilling off 75 ml of toluene
2. additionThe solution was diluted with 150 ml of diethyl ether
3. temperaturecooled to 0°
4. temperatureThe reaction mixture was heated
5. temperatureat reflux for 1.5 hours
6. temperaturecooled to 5°
7. temperatureheated
8. temperatureat reflux for an additional 2.5 hours
9. customThe cooled reaction mixture
10. extractionextracted with ethyl acetate
11. washThe organic extracts were washed with 1N HCl and brine
12. customdried
13. concentrationconcentrated in vacuo
14. customRecrystallization from ethanol