2-(Trifluoromethyl)oxirane → 3-[(2,5-Difluorophenyl)[[3-(1,1,2,2-tetrafluoro-ethoxy)phenyl]methyl]amino]-1,1,1-trifluoro-2-propanol

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Ex-661B) The N-(2,5-difluorophenyl)[[3-(1,1,2,2-tetrafluoroethoxy)phenyl]methyl]-amine (2.22 g, 6.67 mmol) product from EX-661A and 1,1,1-trifluoro-2,3-epoxypropane (1.12 g, 10 mmol) were dissolved in 1.5 mL of acetonitrile. Ytterbium (III) trifluoromethanesulfonate (0.21 g, 0.33 mmol) was added, and the stirred solution was warmed to 50° C. for 2 h under an atmosphere of nitrogen, at which time HPLC analysis indicated that no secondary amine starting material remained. The reaction was quenched with water and extracted with ether. The ether layer was washed with water and brine, then dried over anhydrous MgSO4. The crude product was purified by flash column chromatography on silica gel eluting with ethyl acetate in hexane (1:10) to give 2.49 g (84%) of the desired 3-[(2,5-difluorophenyl)[[3-(1,1,2,2-tetrafluoro-ethoxy)phenyl]methyl]amino]-1,1,1-trifluoro-2-propanol product as a yellow oil, 99% pure by HPLC analysis. HRMS calcd. for C18H14F9NO2: 448.0959 [M+H]+, found: 448.0940.

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