Trifluoroacetic acid → 4-Amino-cyclohexanecarboxylic acid N-methyl-N-((1R)-1-[N-methyl-N-{(1R)-1-methylcarbamoyl-2-phenylethyl}-carbamoyl]-2-(2-naphthyl)ethyl)amide

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Reaction Steps

To a solution of (4-[N-Methyl-N-{(1R)-1-(N-methyl-[(1R)-1-(methylcarbamoyl)-2-phenylethyl]carbamoyl)-2-(2-naphthyl)-ethyl}carbamoyl]cyclohexyl)carbamic acid tert-butyl ester (240 mg, 0.38 mmol) in 1 ml dichloromethane was added 0.5 ml trifluoroacetic acid and the mixture was stirred for 5 min. Sodium bicarbonate was added until gas evolution has ceased, and the mixture was extracted with dichloromethane (3×15 ml). The combined organic phases were washed with brine (5 ml), dried over magnesium sulfate and concentrated in vacuo. The crude product was chromatographed on silica (16 g) with dichloromethane/methanol (4:1). The obtained product was dissolved in 3 ml of methanol and added 40 ml of water and 0.5 ml of acetic acid and lyophilized to give 99 mg of the title compound.

Provenance & Evidence