Acetic Acid → 3-[[3-(Methoxymethyl)phenyl][[3-(1,1,2,2-tetrafluoroethoxy)phenyl]-methyl]amino]-1,1,1-trifluoro-2-propanol

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Reaction Steps

EX-514C) The 3-(methoxymethyl)aniline (1.85 g, 13.51 mmol) product from EX-514B and 3-(1,1,2,2-tetrafluoroethoxy)benzaldehyde (3 g, 13.5 mmol) were dissolved in 25 mL of dichloroethane and acetic acid (0.85 mL, 14.8 mmol), then solid NaBH(OAc)3 (3.73 g, 17.6 mmol) was added. The mixture was stirred at room temperature for 48 hours, then quenched with aqueous saturated sodium bicarbonate and diluted with ethyl acetate. The organic layer was washed with brine, then dried over MgSO4, and concentrated in vacuo to give 4.27 g (12.4 mmol) of crude product. The crude product and 1,1,1-trifluoro-2,3-epoxypropane (1.2 mL, 13.7 mmol) were dissolved in 20 mL of acetonitrile. Ytterbium (III) trifluoromethanesulfonate (0.77 g, 1.24 mmol) was added, and the stirred solution was warmed to 50° C. for 18 hours. The reaction was quenched with water and extracted with ethyl acetate. The organic layer was washed with brine, then dried over MgSO4, and concentrated in vacuo to give 5.96 g (97%) of the desired 3-[[3-(methoxymethyl)phenyl][[3-(1,1,2,2-tetrafluoroethoxy)-phenyl]methyl]amino]-1,1,1-trifluoro-2-propanol product as a brown oil. The crude product was greater than 95% pure by reverse phase HPLC analysis and was used without further purification. HRMS calcd. for C20H21F7NO3: 456.1410 [M+H]+, found: 456.1409. 1H NMR (CDCl3) δ 3.3 (s, 3H), 3.6 (dd, 1H), 3.9 (dd, 1H), 4.3 (m, 1H), 4.4 (s, 2H), 4.7 (m, 2H), 5.9 (tt, 1H), 6.6-6.8 (m, 3H), 7.1-7.2 (m, 4H), 7.3 (t, 1H).

Provenance & Evidence