Hydrochloric Acid → 2''-{(4R,5R)-3-[3,5-bis(trifluoromethyl)benzyl]-4-methyl-2-oxo-1,3-oxazolidin-5-yl}-4'-chloro-2-methyl-4''-(trifluoromethyl)-1,1':3',1''-terphenyl-4-carboxylic acid

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Reaction Steps

To a 1,4-dioxane solution (3 mL) of methyl 2″-{(4R,5R)-3-[3,5-bis(trifluoromethyl)benzyl]-4-methyl-2-oxo-1,3-oxazolidin-5-yl}-4′-chloro-2-methyl-4″-(trifluoromethyl)-1,1′:3′,1″-terphenyl-4-carboxylate (65 mg, 0.089 mmol) was added a solution of lithium hydroxide monohydrate (26 mg, 0.623 mmol) in water (1.2 mL). Aliquot at reaction time 2 hours indicated completion of reaction (atropisomers present). Crude mixture was acidified by HCl (aq, 1N, 1 mL). The cloudy precipitation was dissolved by MeCN (2 mL). The resulting solution was purified by reverse-phase prep-HPLC (Kromasil 100-5C18, 100×21.1 mm) eluting w/a MeCN (0.1% TFA, v/v)/H2O (0.1% TFA, v/v) gradient mixture affording 2″-{(4R,5R)-3-[3,5-bis(trifluoromethyl)benzyl]-4-methyl-2-oxo-1,3-oxazolidin-5-yl}-4′-chloro-2-methyl-4″-(trifluoromethyl)-1,1′:3′,1″-terphenyl-4-carboxylic acid. LCMS calc.=715.12; found=716.20 (M+1)+. 1H NMR signals are doubled because of atropoisomerism. 1H NMR

Provenance & Evidence