Description
4-Nitro-3-trifluoromethyl aniline is an organic intermediate, which can
be used to prepare 4-bromo-2-nitrotrifluorotoluene, an intermediate of
medicine and optical waveguide materials, and flutamide, a non steroidal
anti androgen drug.
Synthesis
The
thiazolium salt 3 (3.30 mg, 0.0122 mmol) was added to a solution of
1-azido-4-nitrobenzene (0.122 mmol) and t-BuOH (18.0 mg, 0.244 mmol) in
degassed THF (0.50 mL) under argon at r.t. The resulting suspension was
stirred for 5 min, and then NaOt-Bu (23.4 mg, 0.244 mmol) was added in
one portion, and the mixture was stirred (Table 2). Water (2 mL) was
added, and the products were extracted with EtOAc (2 á 2 mL), the
combined organic phase was dried over anhyd MgSO4, filtered,
and concentrated in vacuo. Purification was achieved by passing the
resulting residue through a short pad of silica (eluting with 50% light
PE-EtOAc) unless otherwise stated.
4-Nitro-3-trifluoromethyl aniline, Time: 12 h, Pale yellow
solid (21.0 mg, 84%). (70:30 petrol-EtOAc) 0.5; mp 90-93 C (lit.,
92-93 C); IR (FTIR, CHCl3) |ímax cm-1: 3535 (NH2), 3434 (NH2), 1635, 1592 (NO2), 1520 (NO2), 1119; 1H NMR (400 MHz, DMSO-6) 8.59 (d, = 2.7 Hz, 1H), 8.55 (dd, = 9.3, 2.7 Hz, 1H), 7.55 (br s, 2H), 7.32 (d, = 9.3 Hz, 1H); 13C NMR (100 MHz, DMSO-6) 151.8 (C), 135.0 (C), 128.7 (CH), 123.7 (J = 5.9 Hz, F3N2NaO2 [M+Na]+, 229.0195; found, 229.0195.
Fig. The synthetic of 4-Nitro-3-trifluoromethyl aniline
