Reaction Steps
A stirred solution of 5-bromo-3-[(2,2-difluoroethyl)(oxan-4-yl)amino]-2-methylbenzoic acid (250 mg, 0.66 mmol) in dry DMF (3.0 ml) at 0° C. under a balloon of nitrogen, was treated with HATU (327 mg, 0.86 mmol) and DIPEA (230 μl, 1.3 mmol) dropwise. The resulting solution was stirred for 5 minutes and then treated with 3-(aminomethyl)-4,6-dimethyl-1,2-dihydropyridin-2-one (89%, 136 mg, 0.79 mmol). The resulting suspension was stirred at 0° C. for 20 minutes and then stirred at room temperature overnight. After 18 hours, 3-(aminomethyl)-4,6-dimethyl-1,2-dihydropyridin-2-one (25 mg) was added and stirring continued for a further 25 hours. The reaction mixture was diluted with water (30 ml) and CH2Cl2 (30 ml). The layers were separated and the aqueous phase was extracted with CH2Cl2 (3×15 ml). The combined organic phases were washed with a saturated solution of NaHCO3 (aq) (45 ml), water (2×50 ml), brine (2×50 ml), dried (MgSO4), filtered and concentrated in-vacuo. The residue was purified by column chromatography (10 g SNAP cartridge, Isolera, 0-3% MeOH:CH2Cl1) and then triturated with ether. The resulting solid was collected by filtration and dried in-vacuo at 40° C. to give the title compound (259 mg, 77%) as an off white solid. LC-MS 100%, 4.04 min (7 minute LC-MS method), m/z=512.0, 513.0, 514.0, 515.0; 1H NMR (500 MHz, Acetone) δ 10.71 (s, 1H), 7.57-7.49 (m, 2H), 7.25 (d, J=1.9 Hz, 1H), 5.91 (s, 1H), 5.76 (tt, J=56.2, 4.3 Hz, 1H), 4.40 (d, J=5.5 Hz, 2H), 3.88 (dd, J=11.3, 4.2 Hz, 2H), 3.52 (td, J=14.6, 4.2 Hz, 2H), 3.33-3.23 (m, 2H), 3.02 (tt, J=11.6, 3.9 Hz, 1H), 2.32 (s, 3H), 2.28 (s, 3H), 2.24 (s, 3H), 1.73 (dd, J=12.4, 1.9 Hz, 2H), 1.59 (qd, J=12.2, 4.5 Hz, 2H).
