Trifluoroacetic acid → (2R)-N-[2-(2-(phenylsulfonylamino)phenyl)ethyl]-N-methyl-2-(methylamino)-3-(2-naphthyl)propionamide

Participants

Reaction Steps

At 0° C., trifluoroacetic acid (4 ml) was given to a solution of N-((1R)-1-{N-[2-(2-(phenylsulfonylamino)phenyl)ethyl]-N-methylcarbamoyl}2-(2-naphthyl)ethyl)-N-methylcarbamic acid tert-butyl ester (647 mg, 1.08 mmol) in dichloromethane (4 ml). The reaction mixture was stirred for 2.5 h at. 0° C. It was diluted with dichloromethane (15 ml). A saturated aqueous solution of sodium hydrogen carbonate (15 ml) was added. Solid sodium hydrogen carbonate was added until pH 7 was obtained. The phases were separated. The aqueous phase was extracted with dichloromethane (2×15 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 (20 g), using dichloromethane/methanol/25% aqueous ammonia 200:10:1 as eluent to give 434 mg of (2R)-N-[2-(2-(phenylsulfonylamino)phenyl)ethyl]-N-methyl-2-(methylamino)-3-(2-naphthyl)propionamide.

Provenance & Evidence