Toluene → 4-{(S)-4-Carboxy-2-[(5-carboxy-1-phenyl-1H-pyrazole-3-carbonyl)-amino]-butyryl}-piperazine-1-carboxylic acid ethyl ester

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Reaction Steps

To a solution of 50 mg of 4-{(S)-4-tert-Butoxycarbonyl-2-[(5-carboxy-1-phenyl-1H-pyrazole-3-carbonyl)-amino]-butyryl}-piperazine-1-carboxylic acid ethyl ester in 3 ml of DCM, 0.1 ml of TFA was added at RT. After 4 h 20 ml of toluene was added and the solvents were removed under reduced pressure. The residue was purified by preparative HPLC (C18 reverse phase column, elution with a water/MeCN gradient with 0.1% TFA). The fractions containing the product were evaporated and lyophilized to yield a white solid.

Provenance & Evidence