Ethylene Oxide → 2-(2-Triisopropylsilanyloxy-naphthalen-1-yl)-ethanol

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

n-Butyllithium (16.4 mL of 1.6 M soln in hexanes, 26.3 mmol) was stirred with Et2O (60 mL) at −78° C. in an argon-purged, round-bottom flask. A solution of (1-bromo-naphthalen-2-yloxy)-triisopropyl-silane (7.10 g, 18.8 mmol) in Et2O (˜5 ml) was added dropwise to the stirring n-BuLi solution. The reaction was stirred at −78° C. for ten minutes and then a solution of ethylene oxide (1.41 mL, 28.2 mmol) and BF3-Et2O (3.81 mL, 31.0 mmol) in Et2O (˜5 ml) was added via syringe. The reaction was stirred at −78° C. for one hour and then at room temperature for two hours. The reaction was carefully quenched with H2O and was extracted three times with EtOAc. The organic extracts were combined, washed with brine solution, dried over Na2SO4, filtered through celite, and concentrated. The crude product was purified by gradient elution flash chromatography (SiO2, 100% hexanes to 10% EtOAc-hexanes) to give 2-(2-triisopropylsilanyloxy-naphthalen-1-yl)-ethanol (3.41 g, 9.91 mmol) as a colorless oil in 53% yield. MS (APCI) m/z 343.2 (M−1).

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