反应详情

To 27.0 g (0.139 mole) of 1,2-dimethoxy-3(1,1-dimethylethyl)benzene in 350 mL of anhydrous tetrahydrofuran cooled in an ice-brine bath at -5° was added. 87 mL (0.139 mole) of 1.6M butyl lithium in hexane over 30 minutes. The reaction mixture was stirred at -5° for 3 hours and then at reflux for 1 hour. After cooling in an ice bath, 21.5 mL (0.139 mole) of 1,6-dibromohexane in 75 mL of tetrahydrofuran was added dropwise. The reaction mixture was then stirred at reflux for 17 hours. The solvent was removed under reduced pressure, 50 mL of 3N hydrochloric acid was added and the product was extracted with ether. The extract was washed with sodium bicarbonate solution, dried and concentrated at reduced pressure to an oil. Purification by HPLC using 20% toluene-hexane gave 7.6 g ((15% yield) of 1-(6-bromohexyl)-2,3-dimethoxy-4-(1,1-dimethylethyl)benzene.

1. additionwas added
2. temperatureat reflux for 1 hour
3. temperatureAfter cooling in an ice bath
4. stirringThe reaction mixture was then stirred
5. temperatureat reflux for 17 hours
6. customThe solvent was removed under reduced pressure, 50 mL of 3N hydrochloric acid
7. additionwas added
8. extractionthe product was extracted with ether
9. washThe extract was washed with sodium bicarbonate solution
10. customdried
11. concentrationconcentrated at reduced pressure to an oil
12. customPurification by HPLC