Tetrabutylammonium Fluoride → 4-[(S)-2-({5-[2-((S)-2-Cyclobutylcarbamoyl-pyrrolidin-1-yl)-2-oxo-ethoxy]-1-phenyl-1H-pyrazole-3-carbonyl}-amino)-5-hydroxy-pentanoyl]-piperazine-1-carboxylic acid butyl ester

Participants

Reaction Steps

To a solution of 400 mg 4-[(S)-5-(tert-Butyl-diphenyl-silanyloxy)-2-({5-[2-((S)-2-cyclobutylcarbamoyl-pyrrolidin-1-yl)-2-oxo-ethoxy]-1-phenyl-1H-pyrazole-3-carbonyl}-amino)-pentanoyl]-piperazine-1-carboxylic acid butyl ester in 40 ml THF were added 0.6 ml of TBAF (1 M in THF) and the mixture stirred at RT for 12 h. It was concentrated, the residue was dissolved in DCM and washed with water (3×). The solvent was removed under reduced pressure and the residue purified by preparative HPLC (C18 reverse phase column, elution with a water/MeCN gradient with 0.1% TFA). The fractions containing the product were lyophilized to yield the pure product.

Provenance & Evidence