反应详情

2-(4-Chlorophenyl)ethanol (10 g) was stirred in 50 % aqueous sodium hydroxide (70 ml), tetrabutylammoniumbromide (1.4g ) was added and the mixture stirred for 1 hour. t-Butylbromoacetate (28.6 ml) in toluene (140 ml) was added and stirring continued for 18 hours. Water (50 ml) was added and after 2 hours the mixture was cooled in ice and acidified to pH 1 with concentrated hydrochloric acid. The organic layer was separated and the aqueous extracted with ethyl acetate. The combined organic extracts were washed with brine and dried (MgSO4). The solvent was removed in vacuo to give a pale yellow oil This was dissolved in dichoromethane (100 ml) and trifluoroacetic acid (100 ml) added, the mixture was heated at reflux for 1 hour. The volatiles were removed in vacuo and the residue taken up in sodium hydroxide and washed with ethyl acetate. The aqueous layer was then acidified with concentrated hydrochloric acid and extracted with ethyl acetate, this ethyl acetate was washed with water, dried (MgSO4) and the volatiles removed in vacuo to provide the subtitle compound as a buff solid (16.4 g) which was used without further purification.

1. stirringstirring
2. waitcontinued for 18 hours
3. temperaturewas cooled in ice
4. customThe organic layer was separated
5. extractionthe aqueous extracted with ethyl acetate
6. washThe combined organic extracts were washed with brine
7. dry with materialdried (MgSO4)
8. customThe solvent was removed in vacuo
9. customto give a pale yellow oil
10. temperaturethe mixture was heated
11. temperatureat reflux for 1 hour
12. customThe volatiles were removed in vacuo
13. washwashed with ethyl acetate
14. extractionextracted with ethyl acetate
15. washthis ethyl acetate was washed with water
16. dry with materialdried (MgSO4)
17. customthe volatiles removed in vacuo