HOBt (146 mg, 1.07 mmol) and EDCl.HCl (207 mg, 1.07 mmol) were added to a solution of 2-(2-(2-(2-((4-(1-(tert-butoxycarbonyl)azetidin-3-yl)phenyl)amino)-5-(trifluoromethyl)pyrimidin-4-yl)ethyl)phenyl)acetic acid (A81) (0.500 g, 0.898 mmol) and Et3N (455 μL, 4.49 mmol) in DMF (13 mL). After 10 minutes ammonium carbonate (1.65 g, 18.0 mmol) was added and the resulting mixture was stirred at 40° C. for 22 hours. Additional HOBt (0.072 g, 0.539 mmol), EDCl.HCl (0.103 g, 0.539 mmol) and ammonium carbonate (0.413 g, 4.49 mmol) were added and the mixture stirred at 45° C. for 24 hours. The volatiles were removed in vacuo and water (25 mL) added to the residue resulting in the formation of a precipitate. The resulting suspension was sonicated for several minutes, filtered and the filter cake dried to give a solid which was adsorbed onto silica gel and purified by column chromatography (CombiFlash Rf, 40 g SiO2 cartridge, 25-70% EtOAc in cyclohexane) to give the title compound A82 as a white solid (346 mg, 69%); 1H NMR (300 MHz, d6-DMSO) δ 10.21 (s, 1H), 8.68 (s, 1H), 7.74 (d, J=8.6 Hz, 2H), 7.42 (s, 1H), 7.30 (d, J=8.6 Hz, 2H), 7.24-7.16 (m, 4H), 6.91 (s, 1H), 4.23 (t, J=8.0 Hz, 2H), 3.85-3.71 (m, 3H), 3.50 (s, 2H), 3.12-3.04 (m, 4H), 1.40 (s, 9H). LCMS-B: rt 8.187 min; m/z 556 [M+H]+.
