2-(9-bromononoxy)oxane

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: Sodium hydride (60% dispersion in mineral oil, 264 mg, 6.6 mmol) was added at 0° C. to a solution of 2-phenylethanol (807 mg, 6.61 mmol) in tetrahydrofuran (8.6 mL) and N,N-dimethylformamide (3.4 mL), then after 1 h a solution of 2-(9-bromo-nonyloxy)-tetrahydro-pyran (2.44 g, 7.93 mmol) in N,N-dimethylformamide (1.5 mL) was added dropwise. The solution was allowed to reach room temperature over 16 h, then partitioned between water and ethyl acetate. The organic layer was washed with brine, dried over sodium sulfate, filtered, and evaporated. Chromatography (SiO2; heptane-ethyl acetate gradient) produced 2-(9-phenethyloxy-nonyloxy)-tetrahydro-pyran (898 mg, 39%). Colorless oil, m/e=366.2 ([M+NH4]+). partitioned between water and ethyl acetate The organic layer was washed with brine dried over sodium sulfate filtered evaporated

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: A solution of 9-bromo-1-nonanol (2.00 g, 8.96 mmol), 3,4-dihydro-2H-pyran (792 mg, 9.41 mmol), and pyridinium toluene-4-sulfonate (1.08 g, 4.30 mmol) in dichloromethane (34 mL) was stirred at room temperature for 16 h, then washed with 2 M aq. sodium carbonate solution and brine, dried over sodium sulfate, filtered, and evaporated. Chromatography (SiO2; heptane-ethyl acetate gradient) produced 2-(9-bromo-nonyloxy)-tetrahydro-pyran (2.45 g, 89%). Colorless oil, m/e=324.1 ([M+NH4]). washed with 2 M aq. sodium carbonate solution and brine dried over sodium sulfate filtered evaporated