Bicarbonate Ion → (2R)-N-(2-(2-(methylsulfonylamino)phenyl)ethyl)-N-methyl-2-(methylamino)-3-(2-naphthyl)propionamide

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

At 0° C., trifluoroacetic acid (1.5 ml) was added to a solution of N-((1R)-1-(N-(2-(2-(methylsulfonylamino)phenyl)ethyl)-N-methylcarbamoyl)-2-(2-naphthyl)ethyl)-N-methylcarbamic acid tert-butyl-ester (245 mg, 0.45 mmol) in dichloromethane (1.5 ml). The reaction mixture was stirred for 1.75 h at 0° C. Dichloromethane (5 ml) and a saturated aqueous solution of sodium hydrogen carbonate (6 ml) were added successively. Solid soidum hydrogen carbonate was added until pH 7 was obtained. The phases were separated. The aqueous phase was extracted with dichloromethane (3×50 ml). The combined organic layers were dried over magnesium sulfate. The solvent was removed in vacuo. The crude product was purified by flash chromatography on silica (30 g), using dichloromethane/methanol/25% aqueous ammonia (100:10:1) as eluent, to give 155 mg of (2R)-N-(2-(2-(methylsulfonylamino)phenyl)ethyl)-N-methyl-2-(methylamino)-3-(2-naphthyl)propionamide.

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