3-[(3-Nitrophenyl)[[3-(1,1,2,2-tetrafluoroethoxy)phenyl]methyl]amino]1,1,1-trifluoro-2-propanol → 3-[(3-Aminophenyl)[[3-(1,1,2,2-tetrafluoroethoxy)phenyl]methyl]amino]-1,1,1-trifluoro-2-propanol

Participants

Reaction Steps

EX-528C) The 3-[(3-nitrophenyl)[[3-(1,1,2,2-tetrafluoroethoxy)phenyl]methyl]amino]-1,1,1-trifluoro-2-propanol (1.93 g, 4.2 mmol) from EX-528B) was dissolved in 60 mL of acetic acid. Zinc dust (2.1 g, 31.5 mmol) was added, and the solution was stirred at room temperature for 18 hours, at which time HPLC analysis indicated that no nitro starting material remained. The reaction mixture was filtered through celite and concentrated in vacuo. The residue was dissolved in ethyl acetate and washed with aqueous saturated sodium bicarbonate. The organic layer was washed with brine, then dried over MgSO4, and concentrated in vacuo to give 1.4 g (78%) of the desired 3-[(3-aminophenyl)[[3-(1,1,2,2-tetrafluoroethoxy)phenyl]methyl]amino]-1,1,1-trifluoro-2-propanol product as a red oil. The crude product was used without further purification. HRMS calcd. for C18H18F7N2O2: 427.1256 [M+H]+, found: 427.1251. 1H NMR (CDCl3) δ3.4-3.7 (m, 4H), 3.8 (dd, 1H), 4.3 (m, 1H), 4.8 (m, 2H), 5.9 (tt, 1H), 6.1 (s, 1H), 6.2 (m, 2H), 7.0-7.2 (m, 4H), 7.3 (t, 1H).

Provenance & Evidence