反应详情

温度

-78 °C

To a solution of 2-bromo-1-octene (1.25 g, 6.6 mmol, 1.1 equiv) in Et2O (7 mL) was added dropwise t-BuLi (1.5 M, 8.8 mL, 13.2 mmol, 2.2 equiv) under a N2 atmosphere at −78° C. (internal). The pale-yellow, cloudy mixture was stirred for 1 h at −78° C. (internal). The mixture was then added to a solution of dichlorodimethylsilane (1.82 mL, 15.0 mmol, 2.5 equiv) in Et2O (10 mL) by cannula at −78° C. (internal). The mixture was allowed to warm to room temperature and was stirred for 2 h whereupon a white solid precipitated. After removal of solvent and excess dichlorodimethylsilane under reduced pressure, hexane (50 mL) was added and the solids were removed by Schlenk filtration. After removal of the solvent, the residue was dissolved in CH2Cl2 (5 mL). The solution was then added to a solution of 1-phenyl-3-buten-1-ol (888 mg, 6.0 mmol , 1.0 equiv), 4-dimethylaminopyridine (110 mg, 0.9 mmol, 0.15 equiv), and Et3N (1.25 mL, 9.0 mmol, 1.5 equiv) in C2Cl2 (10 mL) under N2 atmosphere at 0° C. (internal). The mixture was allowed to warm to room temperate and was stirred for 2 h. The mixture was then poured to ice water (20 mL) and the aqueous phase was extracted with CH2Cl2 (2×20 mL). The combined organic layers were dried (Na2SO4), filtered and the solvent was removed by rotary evaporation. The residue was purified by chromatography (silica gel, hexane) followed Kugelrohr distillation under reduced pressure to afford 1.25 g (66%) of D-5 as a colorless liquid.

1. temperatureto warm to room temperature
2. stirringwas stirred for 2 h whereupon a white solid
3. customprecipitated
4. customAfter removal of solvent and excess dichlorodimethylsilane under reduced pressure, hexane (50 mL)
5. additionwas added
6. customthe solids were removed by Schlenk
7. filtrationfiltration
8. customAfter removal of the solvent
9. dissolutionthe residue was dissolved in CH2Cl2 (5 mL)
10. temperatureto warm to room temperate
11. stirringwas stirred for 2 h
12. extractionthe aqueous phase was extracted with CH2Cl2 (2×20 mL)
13. dry with materialThe combined organic layers were dried (Na2SO4)
14. filtrationfiltered
15. customthe solvent was removed by rotary evaporation
16. customThe residue was purified by chromatography (silica gel, hexane)
17. distillationKugelrohr distillation under reduced pressure
18. customto afford 1.25 g (66%) of D-5 as a colorless liquid