Sodium hydride → methyl 2''-{(4R,5R)-3-[3,5-bis(trifluoromethyl)benzyl]-4-methyl-2-oxo-1,3-oxazolidin-5-yl}-4'-methoxy-2-methyl-4''-(trifluoromethyl)-1,1':3',1''-terphenyl-4-carboxylate

Participants

Reaction Steps

The starting methyl 4′-methoxy-2-methyl-2″-[(4R,5R)-4-methyl-2-oxo-1,3-oxazolidin-5-yl]-4″-(trifluoromethyl)-1,1′:3′,1″-terphenyl-4-carboxylate (40 mg, 0.080 mmol) was dissolved in anhydrous THF (1 mL) and cooled in an ice bath. Sodium hydride (60% w/w in mineral oil, 3.5 mg, 0.088 mmol) was added into the mixture. The reaction mixture was stirred cold (ice bath) for 10 min followed by addition of 1-(bromomethyl)-3,5-bis(trifluoromethyl)benzene (22 μL, 36.8 mg, 0.120 mmol). The resulting mixture was stirred cold for 20 min then the cold bath was removed. Aliquot at reaction time 2.5 hours indicated about 50% conversion. Reaction crude was cooled (ice bath) and quenched by NH4Cl (aq., sat.). The resulting bi-phasic mixture was worked up with ethyl acetate. The combined organic extracts were dried over Na2SO4, filtered, and concentrated to afford an oil. This oil was purified by a preparative reverse-phase HPLC (Kromasil 100-5C18, 100×21.1 mm) eluted with a MeCN (0.1% TFA, v/v)/H2O (0.1% TFA, v/v) gradient mixture. Related fractions were pooled and evaporated to afford methyl 2″-{(4R,5R)-3-[3,5-bis(trifluoromethyl)benzyl]-4-methyl-2-oxo-1,3-oxazolidin-5-yl}-4′-methoxy-2-methyl-4″-(trifluoromethyl)-1,1′:3′,1″-terphenyl-4-carboxylate. Un-reacted starting material was also recovered. LCMS calc.=725.18; found=726.19 (M+1).

Provenance & Evidence