反应详情

温度

20 °C

tert-Butyldimethylsilylchloride (2.82 g) was added portionwise to a stirred solution of 2-(thiophen-2-yl)ethanol (2 g) and imidazole (1.275 g) in DMF (20 mL) at 20° C. over a period of 20 minutes. The mixture was stirred at 20° C. for 18 hours and then partitioned between ethyl acetate and water, the organic layer was washed with water, dried over sodium sulphate, filtered and the solvent evaporated under reduced pressure. The residue was purified by flash silica chromatography, elution gradient 1-4% ethyl acetate in isohexane. The residue (2.7 g) was dissolved in THF (50 mL) and the solution cooled to −78° C., n-butyllithium (2.5M in hexanes, 5.06 mL) was added dropwise over 10 minutes and the resultant mixture stirred at 0° C. for 1 hour. The reaction mixture was cooled to −78° C. and DMF (5.7 mL) was added dropwise over 5 minutes. The mixture was stirred at 20° C. for 3 hours. The reaction mixture was partitioned between water and ethyl acetate, the organic layer was washed with water, dried over sodium sulphate and the solvent removed under reduced pressure. The crude product was purified by flash silica chromatography, eluting with 7% ethyl acetate in isohexane. Pure fractions were evaporated to dryness to afford the subtitled compound. Yield 2.3 g.

1. custompartitioned between ethyl acetate and water
2. washthe organic layer was washed with water
3. dry with materialdried over sodium sulphate
4. filtrationfiltered
5. customthe solvent evaporated under reduced pressure
6. customThe residue was purified by flash silica chromatography, elution gradient 1-4% ethyl acetate in isohexane
7. dissolutionThe residue (2.7 g) was dissolved in THF (50 mL)
8. temperaturethe solution cooled to −78° C.
9. additionn-butyllithium (2.5M in hexanes, 5.06 mL) was added dropwise over 10 minutes
10. stirringthe resultant mixture stirred at 0° C. for 1 hour
11. temperatureThe reaction mixture was cooled to −78° C.
12. additionDMF (5.7 mL) was added dropwise over 5 minutes
13. stirringThe mixture was stirred at 20° C. for 3 hours
14. customThe reaction mixture was partitioned between water and ethyl acetate
15. washthe organic layer was washed with water
16. dry with materialdried over sodium sulphate
17. customthe solvent removed under reduced pressure
18. customThe crude product was purified by flash silica chromatography
19. washeluting with 7% ethyl acetate in isohexane
20. customPure fractions were evaporated to dryness