反应详情

To a solution of (4S,5R)-5-[3,5-bis(trifluoromethyl)phenyl]-4-methyl-1,3-oxazolidin-2-one (4.55 g, 14.5 mmol) in THF (165 mL) was added sodium hydride (60% dispersion in mineral oil) (968 mg, 24.2 mmol) as a powder. The mixture was stirred at room temperature for 20 min. A solution of 3-bromo-2-(bromomethyl)-6-chloropyridine (2.5 g) in THF (30 mL) was added. The resulting mixture was stirred overnight at room temperature. The reaction was quenched with saturated NH4Cl and extracted with EtOAc (3×). The combined organic layers were washed with brine (1×), dried (Na2SO4) and concentrated in vacuo. The residue was purified by flash chromatography (Si, hexanes/EtOAc) to recover the unreacted 3-bromo-6-chloro-2-methylpyridine and to afford the title compound (4S,5R)-5-[3,5-bis(trifluoromethyl)phenyl]-3-[(3-bromo-6-chloropyridin-2-yl)methyl]-4-methyl-1,3-oxazolidin-2-one. LCMS calc.=517.0; found=517.0 (M+1)+. 1H NMR (500 MHz, CDCl3) δ 7.92 (s, 1H); 7.84 (d, J=8.2 Hz, 1H); 7.83 (s, 2H); 7.21 (d, J=8.2 Hz, 1H); 5.89 (d, J=8.3 Hz, 1H); 5.04 (d, J=17.2 Hz, 1H); 4.47-4.41 (m, 1H); 4.35 (d, J=17.2 Hz, 1H); 0.83 (d, J=6.6 Hz, 3H).

1. stirringThe resulting mixture was stirred overnight at room temperature
2. customThe reaction was quenched with saturated NH4Cl
3. extractionextracted with EtOAc (3×)
4. washThe combined organic layers were washed with brine (1×)
5. dry with materialdried (Na2SO4)
6. concentrationconcentrated in vacuo
7. customThe residue was purified by flash chromatography (Si, hexanes/EtOAc)
8. customto recover the unreacted 3-bromo-6-chloro-2-methylpyridine