Hydrogen Peroxide → (2-Amino-5-(trifluoromethoxy)phenyl)methanol

The 2-amino-5-trifluoromethoxybenzoic acid (2.0 g, 9.0 mmol) in tetrahydrofuran (20 mL) was added dropwise to borane methyl sulfide complex (1.5 mL, 15.0 mmol) in tetrahydrofuran (5 mL). The reaction was refluxed overnight and allowed to cool. A solution of 30% aqueous hydrogen peroxide (0.5 mL), 2.5 N sodium hydroxide (0.5 mL) and water (10 mL) was added drop-wise and the reaction stirred 0.5 hours. After diluting with diethyl ether (50 mL), the organic layer was washed with 0.1 M aqueous sodium meta-bisulfite (2×10 mL) and 2.5 N aqueous sodium hydroxide (2×10 mL). The organic layer was diluted further with hexanes (50 mL) and washed with brine (2×20 mL), dried over anhydrous Na2SO4, and concentrated in vacuo leaving an amber oil (1.9 g) which solidified. The solid was recrystallized from ethyl acetate-hexanes to afford the 2-amino-5-trifluoromethoxybenzyl alcohol as a light amber solid (1.44 g, 77%): mp 75.9–77.6° C. 1H NMR (CDCl3, 300 MHz) 7.00 (m, 2H), 6.65 (d, 1H, J=8.0 Hz), 4.05 (s, 2H), 3.25 (brs, 3H). ESHRMS m/z 208.0592 (M+H+, Calc'd 208.0585). Anal. Calc'd for CH8NO2F3: C, 46.39; H, 3.89; N, 6.76. Found: C, 46.61; H, 3.79; N, 6.71.

1. temperatureThe reaction was refluxed overnight
2. temperatureto cool
3. washthe organic layer was washed with 0.1 M aqueous sodium meta-bisulfite (2×10 mL) and 2.5 N aqueous sodium hydroxide (2×10 mL)
4. additionThe organic layer was diluted further with hexanes (50 mL)
5. washwashed with brine (2×20 mL)
6. dry with materialdried over anhydrous Na2SO4
7. concentrationconcentrated in vacuo

ORD record

ord-4fcc494ad3b04466a6f0519069773e30

Source dataset

uspto-grants-2006_11

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07138411B2