4-Methylmorpholine → (r)-4,4,4-Trifluoro-n-(1-(4-fluoro-3-isopropoxyphenyl)-1-(3-fluoro-5-(1,1,2,2,-tetrafluoroethoxy) phenyl)-2-phenylethyl)butanamide

Participants

Reaction Steps

To a solution of 4,4,4-trifluorobutyric acid (13 mg, 0.09 mmol) in DCM (0:8 mL) was added (benzotriazol-1-yloxy)tripyrrolidinophosphonium hexafluorophosphate (52 mg, 0.1 mmol), (R)-1-(4-fluoro-3-isopropoxyphenyl)-1-(3-fluoro-5-(1,1,2,2-tetrafluoroethoxy)phenyl)-2-phenylethanamine (40 mg, 0.08 mmol), followed by NMM (28 μl, 0.25 mmol). The reaction mixture was stirred at room temperature for 16 h, then another 16 h at 60° C. The reaction mixture was diluted with EtOAc (10 mL) and the organic layer was washed with H2O, dried over MgSO4, filtered and concentrated. The residue was purified by preparative HPLC Phenomenex Luna C18 column, 30×50 mm eluting with 10-90% ACN/H2O over 10 minutes containing 0.1% TFA; 40 mL/min, monitoring at 220 nm; 40-100% ACN (90% in water, 0.1% TFA) gradient over 10 min with flow rate 40 mL/min and UV detection at 220 nm. (R)-4,4,4-trifluoro-N-(1-(4-fluoro-3-isopropoxyphenyl)-1-(3-fluoro-5-(1,1,2,2,-tetrafluoroethoxy)phenyl)-2-phenylethyl)butanamide (Example 312) was isolated as a lyophillate (27 mg, 55% yield). LCMS: RT=2.15 min [M+H] 608.2 (2 min Phenomenex Luna C18 column, 4.6×30 mm eluting with 10-90% MeOH/H2O over 2 minutes containing 0.1% TFA; 5 mL/min, monitoring at 220 nm); HPLC: RT=3.79 min, Purity 100% (Phenomenex Luna C18 column, 4.6×50 mm eluting with 10-90% ACN/H2O over 4 minutes containing 0.1% TFA; 4 mL/min, monitoring at 220 nm); 1H NMR (400 MHz, CDCl3) δ ppm 1.18 (d, J=6.05 Hz, 3H), 1.24 (d, J=6.05 Hz, 3H), 2.34-2.48 (m, 2H), 2.51-2.61 (m, 2H), 3.79 (d, J=13.19 Hz, 1H), 3.98 (d, J=13.19 Hz, 1H), 4.29-4.39 (m, 1H), 6.12-6.44 (m, 1H), 6.67-6.82 (m, 4H), 6.91-7.07 (m, 4H), 7.10-7.19 (m, 3H), 8.29 (s, 1H).

Provenance & Evidence