Trifluoroacetic acid → methyl (2R)-2-amino-5-[5-[{2-[3,5-bis(trifluoromethyl)phenyl]-2-methylpropanoyl}(methyl)amino]-4-(4-fluoro-2-methylphenyl)-2-pyridinyl]-4-pentynoate

Participants

Reaction Steps

Trifluoroacetic acid (15 ml) was added dropwise to an ice-cooled solution of methyl (2R)-5-[5-[{2-[3,5-bis(trifluoromethyl)phenyl]-2-methylpropanoyl}(methyl)amino]-4-(4-fluoro-2-methylphenyl)-2-pyridinyl]-2-({[(1,1-dimethylethyl)oxy]carbonyl}amino)-4-pentynoate (Intermediate 12, 2.4 g, 3.32 mmol) in anhydrous Dichloromethane (45 ml) and the resulting reaction mixture was stirred at room temperature for 1 h. Volatiles were evaporated. The reaction crude was taken-up in saturated NaHCO3 aqueous solution [until pH=7] (30 ml) and extracted with DCM (2×50 ml). The organic layers were collected, dried over sodium sulphate, filtered and evaporated to obtain the title compound (1.85 g, 2.97 mmol, 89% yield) as a brown solid. UPLC: Rt 0.78 min, m/z 624 [M+H+].

Provenance & Evidence