(4S,5R)-5-[3,5-bis(trifluoromethyl)phenyl]-3-[2-iodo-5-(trifluoromethyl)benzyl]-4-methyl-1,3-oxazolidin-2-one (500 mg, 0.837 mmol) was mixed with (5-bromo-2-fluorophenyl)boronic acid (211 mg, 0.963 mmol), toluene (5 mL), ethanol (278 μL) and sodium carbonate aqueous solution (2M, 0.89 mL, 1.78 mmol). The resulting mixture was stirred at 20° C. for 30 min followed by addition of tetrakis (triphenylphosphine) palladium(0) (43.5 mg, 0.0376 mmol, 4.5 mol %). The reaction mixture was heated in a 90° C. oil bath for 40 hours to complete the reaction. The resulting crude mixture was purified by flash chromatography (SiO2, Biotage 40+M cartridge). The column was eluted by an Ethyl acetate/hexanes mixture. Related fractions were pooled and concentrated in vacuo to afford (4S,5R)-5-[3,5-bis(trifluoromethyl)phenyl]-3-{[5′-bromo-2′-fluoro-4-(trifluoromethyl)biphenyl-2-yl]methyl}-4-methyl-1,3-oxazolidin-2-one. LCMS calc.=645.02; found=645.94 (M+1)+.
