2-(Trifluoromethyl)oxirane → 3-((3-Phenoxyphenyl)((3-(1,1,2,2-tetrafluoroethoxy)phenyl)methyl)amino)-1,1,1-trifluoro-2-propanol

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Reaction Conditions

Reaction Steps

To a mixture of the amine product (15.0 g, 0.038 mol) from EX-1B and 1,1,1-tri-fluoro-2,3-epoxypropane (8.58 g, 0.077 mol, TCI) was added a suspension of ytterbium (III) trifluoromethanesulfonate (2.37 g, 0.0031 mol) in 15 mL of acetonitrile. The resulting mixture was heated at 50° C. in a sealed glass vial for 1.5 h. The reaction mixture was cooled to room temperature then diluted with water and ethyl acetate and extracted. The organic layers were combined, dried over MgSO4, and concentrated in vacuo. The crude product was purified by column chromatography on silica gel eluting with 1:4 ethyl acetate in hexane to afford 12.03 g (62%) of the desired (2RS)-3-[(3-phenoxyphenyl)[[3-(1,1,2,2-tetrafluoroethoxy) phenyl]methyl]amino]-1,1,1-trifluoro-2-propanol product as a yellow oil. Anal. calcd. for C24H20F7NO3: C, 57.26; H, 4.00; N, 2.78. Found: C, 56.96; H, 4.35; N, 2.69. HRMS calcd. 504.1410 [M+H]+. found: 504.1431. 1H NMR (CDCl3) δ 7.28 (m, 4H), 7.14 (t, 1H), 7.07, (m, 3H), 7.00 (s, 1H), 6.94 (d, 2H), 6.46 (dd, 1H), 6.38 (dd, 1H), 6.35 (t, 1H), 5.84 (t, 1H), 4.60 (t, 2H), 4.36 (m, 1H), 3.82 (d, 1H), 3.48 (m, 1H), 2.51 (s, 1H). 19F NMR (CDCl3) δ −79.0 (s, 3F), −88.21 (d, 2F), −137.05 (dd, 2F).

Provenance & Evidence