Dichlorodimethylsilane → Dimethyl-(2octenyl)-[(1-phenyl-3-methyl-3-butenyl)oxy]silane

Participants

Reaction Conditions

Reaction Steps

To a solution of 2-bromo-octene (2.85 g, 15.0 mmol 1.2 equiv) in Et2O (15 mL) was added dropwise with t-BuLi (1.5 M, 20.0 mL, 30.0 mmol, 2.4 equiv) under 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 (3.8 mL, 31.25 mmol, 2.5 equiv) in Et2O (15 mL) via 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 mixture of 1-phenyl-3-methyl-3-buten-1-ol (2.03 g, 12.5 mmol, 1.0 equiv), 4dimethylaminopyridine (229 mg, 1.88 mmol, 0.15 equiv), and Et3N (2.6 mL, 18.8 mmol, 1.5 equiv) in CH2Cl2 (10 mL) under N2 atmosphere at 0° C. (internal). The mixture was allowed to warm to room temperature and was stirred for 2 h. The mixture was then poured to ice water (20 mL) and 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 2.85 g (69%) of E-5 as a colorless liquid.

Provenance & Evidence