4-((S)-4-tert-Butoxycarbonyl-2-{[5-(3,3-dimethyl-2-oxo-butoxy)-1-phenyl-1H-pyrazole-3-carbonyl]-amino}-butyryl)-piperazine-1-carboxylic acid benzyl ester → (S)-4-{[5-(3,3-Dimethyl-2-oxo-butoxy)-1-phenyl-1H-pyrazole-3-carbonyl]-amino}-5-oxo-5-piperazin-1-yl-pentanoic acid tert-butyl ester

Participants

Reaction Steps

To a solution of 4.4 g 4-((S)-4-tert-Butoxycarbonyl-2-{[5-(3,3-dimethyl-2-oxo-butoxy)-1-phenyl-1H-pyrazole-3-carbonyl]-amino}-butyryl)-piperazine-1-carboxylic acid benzyl ester in 40 ml ethanol were added 0.9 g Pd/C (10%) and the suspension stirred under an atmosphere of hydrogen (3 bar) for 24 h. It was filtrated, washed with ethanol and the solvent evaporated to give the title compound as colorless oil (4.1 g).

Provenance & Evidence