反应详情

温度

5 °C

Sodium hydride (60 weight %; 1.79 g; 44.8 mmol) is washed with hexanes (3×10 mL) under an argon blanket. DMF (17 mL) is then added at ambient temperature and the stirred slurry is cooled to 5° C. A solution of 5-hydroxyquinoline (5.00 g; 34.4 mmol) in DMF (65 mL) is added dropwise over 30 minutes. The resulting mixture is allowed to warm to ambient temperature over 1 hour affording a clear, reddish-brown solution. A solution of (R)-(−)-glycidyl tosylate (10.22 g; 44.8 mmol) in DMF (50 mL) is added dropwise over 20 minutes. The resulting mixture is stirred at ambient temperature for 4 hours, quenched by the addition of saturated aqueous ammonium chloride (25 mL), poured onto water (750 mL), and extracted with ether (3×375 mL). The combined ether layers are washed with saturated aqueous sodium bicarbonate (2×375 mL), then dried over MgSO4, filtered, and concentrated in vacuo. The residue is purified via silica gel chromatography with gradient elution (33%→50% ethyl acetate in hexanes) affording the desired product (4.95 g) as a tan solid. ESMS: MH+ 202.2 (base).

1. temperatureto warm to ambient temperature over 1 hour
2. customaffording a clear, reddish-brown solution
3. customquenched by the addition of saturated aqueous ammonium chloride (25 mL)
4. additionpoured onto water (750 mL)
5. extractionextracted with ether (3×375 mL)
6. washThe combined ether layers are washed with saturated aqueous sodium bicarbonate (2×375 mL)
7. dry with materialdried over MgSO4
8. filtrationfiltered
9. concentrationconcentrated in vacuo
10. customThe residue is purified via silica gel chromatography with gradient elution (33%→50% ethyl acetate in hexanes)