Sodium hydride → (4S)-4-benzyl-3-{[4'-fluoro-5'-isopropyl-2'-methoxy-4-(trifluoromethyl)biphenyl-2-yl]methyl}-1,3-oxazolidin-2-one

Participants

Reaction Steps

A stirred suspension of sodium hydride (60% in oil, 37 mg, 0.926 mmol) in THF (1 mL) was treated at 0° C. with (S)-4-benzyl-2-oxazolidinone (33 mg, 0.185 mmol) dissolved in THF (1 mL), under an atmosphere of N2. The reaction was stirred for 20 min and a solution of 2′-(bromomethyl)-4-fluoro-5-isopropyl-2-methoxy-4′-(trifluoromethyl)biphenyl (Intermediate 10, 50 mg, 0.124 mmol) in THF (1 mL) was added dropwise. The reaction was stirred at room temperature for 60 h. The reaction was quenched with H2O (1 mL) and partitioned between EtOAc (25 mL) and H2O (10 mL). The aqueous phase was re-extracted with EtOAc (3×15 mL) and the combined organic extracts were washed with brine (25 mL), dried (MgSO4) and concentrated in vacuo to give the crude product. This was purified by flash silica-gel chromatography (0-25% EtOAc/hexanes gradient) to afford (4S)-4-benzyl-3-{[4′-fluoro-5′-isopropyl-2′-methoxy-4-(trifluoromethyl)biphenyl-2-yl]methyl}-1,3-oxazolidin-2-one as a clear glass. LCMS=502.3 (M+1)+. 1H NMR (CDCl3, 500 MHz, mixture of atropisomers) δ 7.69-7.64 (m, 1H), 7.58 (s, 1H), 7.39-7.36 (m, 1 H), 7.29-7.24 (m, 3 H), 7.06 (d, J=8.5 Hz, 1H), 6.97-6.91 (m, 2 H), 6.73 (d, J=11.7, 1H), 4.79 (d, J=15.8 Hz, 1H), 4.30 (d, J=15.8 Hz, 1 H), 4.08-4.05 (m, 1H), 3.99-3.97 (m, 1H), 3.76 (s, 3H), 3.65-3.58 (m, 1H), 3.27-3.17 (m, 1 H), 2.81 (dd, J=13.5, 4.1 Hz, 1H), 2.45-2.40 (m, 1 H), 1.30-1.4 (m, 6 H).

Provenance & Evidence