반응 단계
Sodium hydride (6.4 mg of a 60% dispersion in mineral oil, 0.161 mmol) was added to a stirred solution of 5-(4-methylphenyl)-1,3-oxazolidin-2-one (37.7 mg, 0.0973 mmol) in dry THF (1 mL) at room temperature under N2. The reaction was stirred for 30 min and a solution of 2-(bromomethyl)-5′-isopropyl-2′-methoxy-4-(trifluoromethyl)biphenyl (19.0 mg, 0.107 mmol) in dry THF (2 mL) was added by cannula. The reaction was stirred at room temperature for 3 days. The reaction was quenched with saturated NH4Cl (10 mL) and extracted with EtOAc (3×20 mL). The combined organic extracts were washed with brine (10 mL), dried (Na2SO4) and concentrated in vacuo to give the crude product. This was purified by flash chromatography (Si, 12×160 mm, 0-80% EtOAc in hexanes gradient) to afford 3-{[5′-isopropyl-2′-methoxy-4-(trifluoromethyl)biphenyl-2-yl]methyl}-5-(4-methylphenyl)-1,3-oxazolidin-2-one as a colorless oil. Rf=0.37 (20% EtOAc/hexanes). LCMS calc.=484.21; found=484.2 (M+1)+. 1H NMR (benzene-d6, 500 MHz, 1:1 mixture of atropisomers) δ 7.76 (s, 0.5H), 7.65 (s, 0.5H), 7.31 (d, J=7.7 Hz, 1H), 7.08 (dd, J=8.4, 2.4 Hz, 1H), 7.05 (br d, J=7.8 Hz, 1H), 6.95-6.86 (m, 5H), 6.58 (t, J=7.7 Hz, 1H), 4.74 (t, J=8.0 Hz, 0.5H), 4.70 (t, J=8.0 Hz, 0.5H), 4.50 (d, J=15.7 Hz, 0.5H), 4.42 (d, J=15.7 Hz, 0.5H), 4.25 (d, J=15.7 Hz, 0.5H), 4.11 (d, J=15.7 Hz, 0.5H), 3.26 (s, 1.5H), 3.21 (s, 1.5H), 2.81 (t, J=8.6 Hz, 0.5H), 2.76 (septet, J=7.0 Hz, 1H), 2.68 (t, J=8.6 Hz, 0.5H), 2.55 (t, J=8.6 Hz, 0.5H), 2.53 (t, J=8.6 Hz, 0.5H), 2.04 (s, 3H), 1.20 (t, J=7.0 Hz, 3H), 1.19 (t, J=7.0 Hz, 3H).
