Ethyl Acetate → 1-(2-(Pyrimidin-2-yl)-1,1-bis(3-(trifluoromethoxy)phenyl)ethyl)-3-(2,2,2-trifluoroethyl)urea

Participants

Reaction Conditions

Reaction Steps

To a mixture of 3-(pyrimidin-2-yl)-2,2-bis(3-(trifluoromethoxy)phenyl)propanoic acid (20 mg, 0.042 mmol) and diphenyl phosphoryl azide (70 mg, 0.254 mmol) in toluene (1.5 mL) was added TEA (88 μL, 0.63 mmol) dropwise and the reaction mixture was heated at 110° C. for 20 min. 2,2,2-Trifluoroethanamine (7 μL, 0.084 mmol) was added and the reaction mixture was stirred at 110° C. for 1 h. The reaction mixture was allowed to cool to rt and diluted with EtOAc (25 mL). The organic layer was washed with H2O (25 mL), 1 N HCl (25 mL) and saturated NaHCO3 (25 mL), dried over MgSO4, filtered and concentrated under reduced pressure. The residue was purified by preparative HPLC (Shimadzu-YMC-Sunfire 5μ column, 30×100 mm eluting with 40-100% MeOH (90% in H2O, 0.1% TFA) gradient over 10 min with flow rate 40 mL/min and UV detection at 220 nm). The product that eluted at retention time of 9.42 min was isolated as a clear oil, and further purified by Prep TLC (Uniplate, Silica Gel GF, 20×20 cm, 1000 Microns) using Hexane/EtOAc (1/2) to yield 1-(2-(pyrimidin-2-yl)-1,1-bis(3-(trifluoromethoxy)phenyl)ethyl)-3-(2,2,2-trifluoroethyl)urea (Example 279) as a white solid (4 mg, 16% yield). LCMS: RT=1.867 min [M+H] 568.87 (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=3.973 min, Purity 100% (Phenomenex Luna C18 column, 4.6×50 mm eluting with 10-90% MeOH/H2O over 4 minutes containing 0.2% PPA; 4 mL/min, monitoring at 220 nm); NMR: 400 MHz 1H (CDCl3) 8.52 ppm, 2H, d, J=4.83 Hz; 7.98 ppm, 1H, s; 7.33 ppm, 5H, m; 7.23 ppm, 2H, s; 7.08 ppm, 3H, t, J=5.05 Hz; 4.61 ppm, 1H, t, J=6.37 Hz; 3.85 ppm, 2H, s; 3.77 ppm, 2H, ddd, J=15.71, 9.12, 9.01 Hz.

Provenance & Evidence