反应详情

Sodium hydride (34 mg, 0.84 mmol, 1.5 equiv) was carefully added to a solution of (R)-4-(((tert-butyldiphenylsilyl)oxy)methyl)oxazolidin-2-one (200 mg, 0.563 mmol) in DMF (2.8 mL). The mixture was stirred at room temperature for 20 minutes and then 2,4-difluoropyrimidine (0.072 mL, 0.84 mmol, 1.5 equiv) was added (bubbling). The yellow suspension was stirred for minutes and the reaction was then carefully quenched with saturated aqueous ammonium chloride (5 mL). Water (20 mL) was added and the mixture was extracted with ethyl acetate (2×25 mL). The combined organic extracts were washed with saturated aqueous sodium chloride (20 mL), dried over Na2SO4, filtered and concentrated. Silica gel column chromatography (EtOAc/Heptane 30%) provided (R)-4-(((tert-butyldiphenylsilyl)oxy)methyl)-3-(2-fluoropyrimidin-4-yl)oxazolidin-2-one (0.185 g, sticky colorless oil) in 73% yield. 1H NMR (400 MHz, CDCl3) δ 8.44 (dd, J=5.8, 2.2 Hz, 1H), 8.12 (dd, J=5.8, 3.4 Hz, 1H), 7.58 (m, 2H), 7.48-7.32 (m, 6H), 7.23 (m, 2H), 4.80 (m, 1H), 4.65 (dd, J=8.6, 3.0 Hz, 1H), 4.55 (m, 1H), 4.18 (dd, J=11.1, 3.5 Hz, 1H), 3.83 (dd, J=11.1, 2.1 Hz, 1H), 1.04 (s, 9H). MS m/z 452.3 (M+H)+; Rt-1.15 min.

1. custom(bubbling)
2. stirringThe yellow suspension was stirred for minutes
3. customthe reaction was then carefully quenched with saturated aqueous ammonium chloride (5 mL)
4. additionWater (20 mL) was added
5. extractionthe mixture was extracted with ethyl acetate (2×25 mL)
6. washThe combined organic extracts were washed with saturated aqueous sodium chloride (20 mL)
7. dry with materialdried over Na2SO4
8. filtrationfiltered
9. concentrationconcentrated