Reaction Steps
A 0° C. solution of Example B1 (0.19 g, 1.116 mmol) and pyridine (0.26 mL, 3.21 mmol) in DCM (5 mL) was treated drop-wise with phosgene (20% in toluene, 1.4 mL, 2.65 mmol) and warmed to RT over 0.5 h. The mixture was treated slowly with a solution of 6-ethyl-5-((6′-methyl-[2,3′-bipyridin]-4-yl)oxy)pyridin-2-amine (0.16 g, 0.522 mmol) and pyridine (0.16 mL, 1.978 mmol) in DCM (5 mL) and stirred at RT overnight. The mixture was treated with satd. NaHCO3, extracted with EtOAc (4×) and the combined organics were dried over MgSO4, concentrated to dryness, purified via silica gel chromatography (MeOH/DCM), then re-purified via reverse-phase chromatography (MeCN/H2O with 0.1% TFA). The combined fractions were treated with satd. NaHCO3, extracted with DCM (5×) and the combined organics were dried over MgSO4 and concentrated to dryness to afford N-(6-ethyl-5-((6′-methyl-[2,3′-bipyridin]-4-yl)oxy)pyridin-2-yl)-2-oxo-3-(tetrahydro-2H-pyran-4-yl)imidazolidine-1-carboxamide (19 mg, 7%). 1H NMR (400 MHz, DMSO-d6): δ 10.93 (s, 1 H), 9.09 (d, J=2.4 Hz, 1 H), 8.52 (d, J=5.7 Hz, 1 H), 8.28 (dd, J=8.1, 2.4 Hz, 1 H), 7.90 (d, J=8.8 Hz, 1 H), 7.64 (d, J=8.8 Hz, 1 H), 7.59 (d, J=2.4 Hz, 1 H), 7.33 (d, J=8.2 Hz, 1H), 6.77 (dd, J=5.7, 2.4 Hz, 1 H), 3.94-3.84 (m, 3 H), 3.83-3.79 (m, 2 H), 3.46 (t, J=8.2 Hz, 2 H), 3.38 (t, J=11.6 Hz, 2 H), 2.58 (q, J=7.5 Hz, 2 H), 2.50 (s, 3 H), 1.72 (dd, J=12.3, 4.5 Hz, 2 H), 1.62 (s, 2 H), 1.12 (t, J=7.5 Hz, 3H); MS (ESI) m/z: 503.3 (M+H+).
