4-[(S)-2-({5-[(1-Benzyloxycarbonyl-cyclobutylcarbamoyl)-methoxy]-1-phenyl-1H-pyrazole-3-carbonyl}-amino)-4-tert-butoxycarbonyl-butyryl]-piperazine-1-carboxylic acid ethyl ester → 4-[(S)-4-tert-Butoxycarbonyl-2-({5-[(1-carboxy-cyclobutylcarbamoyl)-methoxy]-1-phenyl-1H-pyrazole-3-carbonyl}-amino)-butyryl]-piperazine-1-carboxylic acid ethyl ester

Participants

Reaction Steps

To a solution of 4.7 g 4-[(S)-2-({5-[(1-Benzyloxycarbonyl-cyclobutylcarbamoyl)-methoxy]-1-phenyl-1H-pyrazole-3-carbonyl}-amino)-4-tert-butoxycarbonyl-butyryl]-piperazine-1-carboxylic acid ethyl ester in 100 ml ethyl acetate were added under argon 0.5 g Pd/C (10%) and the suspension was stirred under an atmosphere of hydrogen (3 bar) for 24 h. The suspension was filtered over a plug of Celite® and washed with ethyl acetate. The crude product obtained after evaporation of the solvent was used in the subsequent reaction. Yield: 3.7 g

Provenance & Evidence