Trifluoroacetic acid → 4-{[(2R,3S,4R,5S)-3-(3-chloro-2-fluoro-phenyl)-4-(4-chloro-2-fluoro-phenyl)-4-cyano-5-(2,2-dimethyl-propyl)-pyrrolidine-2-carbonyl]-amino}-3-methoxy-benzoic acid phosphonooxymethyl ester, trifluoro-acetate salt

Participants

Reaction Steps

In a 25 mL pear-shaped flask, (di-tert-butoxyphosphoryloxy)methyl 4-((2R,3S,4R,5S)-3-(3-chloro-2-fluorophenyl)-4-(4-chloro-2-fluorophenyl)-4-cyano-5-neopentylpyrrolidine-2-carboxamido)-3-methoxybenzoate (20 mg, 23.8 μmmol, Example 2) was combined with dichloromethane (1 mL) to give a colorless solution which was cooled in an ice-water bath. After 5 min trifluoroacetic acid (744 mg, 0.5 mL, 6.53 mmol) was added over 8 min. The reaction mixture was concentrated and dried in vacuo overnight to give 4-{[(2R,3S,4R,5S)-3-(3-chloro-2-fluoro-phenyl)-4-(4-chloro-2-fluoro-phenyl)-4-cyano-5-(2,2-dimethyl-propyl)-pyrrolidine-2-carbonyl]-amino}-3-methoxy-benzoic acid phosphonooxymethyl ester, trifluoro-acetate salt, as off-white solids (19.5 mg, 97%).

Provenance & Evidence