反应详情

After (S)-2-octanol (300 mg, 2.30 mmol), triphenylphosphine (725 mg, 2.76 mmol), 4-nitrobenzoic acid (463 mg, 2.76 mmol), and toluene (12 ml) were added to a 50 ml flask, azodicarboxylic acid bis(2-methoxyethyl) ester (648 mg, 2.76 mmol) dissolved in toluene (6 ml) was added dropwise thereto at 20° C., and the reaction was allowed to proceed for 3.5 hours. Water (10 mL) was added, and separation was carried out. Then, the aqueous layer was extracted using toluene (10 mL, ×1). The resulting organic layer was collectively 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 (615 mg, yield: 96%/(S)-2-octanol).

1. additionwas added dropwise
2. customat 20° C.
3. customseparation
4. extractionThen, the aqueous layer was extracted
5. washThe resulting organic layer was collectively 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)