Reaction Steps
Reaction of 4-trifluoromethylanthranilic acid and methyl 2-iodobenzoate by the reported method [Rewcastle and Denny, Synth, Comm 1987, 17, 309 gave 4-trifluoromethyl-2-(2-methoxycarbonylphenyamino)benzoic acid (43%), mp (MeOH/H2O) 206-207° C. 1H NMR [(CD3)2SO] δ 3.87 (s, 3 H, CO2CH3), 7.12 (ddd, J=8.0, 6.1, 2.1 Hz, 1 H., H-5'), 7.23 (dd, J=8.3, 1.0 Hz, 1 H, ArH), 7.55-7.62 (m, 3 H, 3×ArH), 7.95 (dd, J=8.0, 1.3 Hz, 1 H, ArH), 8.12 (d, J=8.2 Hz, 1 H, ArH). Formation of the corresponding imidazolide and immediate reduction of this as above gave methyl-2-[N-(5'-trifluoromethyl-2'-hydroxymethyl)phenyl-amino]benzoate (86%), mp (hexane) 86-87° C. 1H NMR (CDCl3) δ 2.00 (t, J=5.6 Hz, 1 H, OH), 3.92 (s, 3 H, CO2CH3), 4.78(d, J=5.3 Hz, 2 H, CH2), 6.84 (td, J=7.6, 1.1 Hz, 1 H, ArH), 7.15 (dd, J=8.6, 0.8 Hz, 1 H, ArH), 7.31-7.39 (m, 2 H, 2×ArH), 7.52 (d, J=7.7 Hz, 1 H, ArH), 7.70 (s, 1 H, H-6'), 8.76 (dd, J=8.0, 1.6 Hz, 1 H, ArH), 9.72 (s, 1 H, NH).
