反应详情

After (S)-2-octanol (300 mg, 2.30 mmol), triphenylphosphine (724 mg, 2.76 mmol), 4-nitrobenzoic acid (465 mg, 2.76 mmol), and THF (12 ml) were added to a 50 ml flask, a 40% azodicarboxylic acid diisopropyl ester-toluene solution (1.45 ml, 2.76 mmol) dissolved in THF (6 ml) was added dropwise thereto at 20° C., and the reaction was allowed to proceed for two hours. Water (0.5 mL) was added, and concentration was carried out. Then, water (10 ml) was added to the solution, and extraction was then carried out using diethyl ether (10 ml,×2). Then, the organic layer was washed with water (10 mL) and saturated salt water (10 ml), and dehumidified with anhydrous magnesium sulfate. Subsequently, a crude product obtained by concentration was purified by column chromatography (silica gel, 5% ethyl acetate-hexane solution) to give (R)-2-(4-nitrobenzoyloxy)octane as a pale yellow liquid substance (616 mg, yield: 96%/(S)-2-octanol).

1. additionwas added dropwise
2. customat 20° C.
3. concentrationconcentration
4. additionThen, water (10 ml) was added to the solution, and extraction
5. washThen, the organic layer was washed with water (10 mL) and saturated salt water (10 ml)
6. customSubsequently, a crude product obtained by concentration
7. customwas purified by column chromatography (silica gel, 5% ethyl acetate-hexane solution)