反应详情

A solution of (R)-4-phenyloxazolidin-2-one (2.9484 g, 18.07 mmol) and 2,4-dichloropyrimidine (3.1872 g, 21.39 mmol, 1.184 equiv) in DMF (30 mL) was treated with NaH (95%, 0.4773 g, 18.89 mmol, 1.046 equiv), then the resulting mixture (yellow to red cloudy) was stirred at room temperature for 3 h. The reaction mixture was diluted with EtOAc (200 mL), washed with sat. NH4Cl (75 mL) and 4% aqueous NaCl (2×100 mL), dried over Na2SO4, filtered and concentrated. Silica gel column chromatography (EtOAc/Heptane 0 to 40%) provided (R)-3-(2-chloropyrimidin-4-yl)-4-phenyloxazolidin-2-one (2.7020 g, white sticky solid) in 46.9% yield. 1H NMR (400 MHz, CD3OD) δ 8.47 (d, J=5.6 Hz, 1H), 8.18 (d, J=6.1 Hz, 1H), 7.38-7.30 (m, 5H), 5.81 (dd, J=8.6, 3.5 Hz, 1H), 4.88 (t, J=8.6 Hz, 1H), 4.37 (dd, J=8.6, 3.5 Hz, 1H); MS m/z 276.4 (M+H)+.

1. washwashed with sat. NH4Cl (75 mL) and 4% aqueous NaCl (2×100 mL)
2. dry with materialdried over Na2SO4
3. filtrationfiltered
4. concentrationconcentrated