Trifluoroacetic acid → 4-[(S)-4-Carboxy-2-({4-[2-((S)-2-cyclobutylcarbamoyl-pyrrolidin-1-yl)-2-oxo-ethoxy]-7-methyl-naphthalene-2-carbonyl}-amino)-butyryl]-piperazine-1-carboxylic acid butyl ester

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Reaction Steps

To a solution of 1.5 g 4-[(S)-4-tert-Butoxycarbonyl-2-({4-[2-((S)-2-cyclobutylcarbamoyl-pyrrolidin-1-yl)-2-oxo-ethoxy]-7-methyl-naphthalene-2-carbonyl}-amino)-butyryl]-piperazine-1-carboxylic acid butyl ester in 10 ml dichloromethane were added 1.1 g TFA. After 3 h stirring at RT the solvents were removed and the residue was codistilled twice with toluene. The crude product was purified by preparative HPLC (C18 reverse phase column, elution with a water/MeCN gradient with 0.1% TFA). Yield: 970 mg MS (ES+): m/e=708.

Provenance & Evidence