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

To a 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, 1 g, 1.382 mmol) in Dichloromethane (15 ml), TFA (5 ml, 64.9 mmol) was added and the reaction mixture was stirred for 1 h at r.t. The solvent and the excess of TFA were evaporated and the residue purified by SPE-SCX cartridge to obtain Intermediate 13. This residue was dissolved in Acetonitrile (14 ml) and Silver trifluoromethanesulfonate (0.036 g, 0.138 mmol) was added; the reaction mixture was stirred for 6 hours at 60° C. The solvent was evaporated and the residue was dissolved in DCM (15 ml) and the metal catalyst was filtered off. The organic solution was evaporated affording the title compound (800 mg, 1.283 mmol, 93% yield) as an orange solid. UPLC: Rt 0.95 min, m/z 624 [M+H+].

Provenance & Evidence