反应详情

A mixture of Example C2 (0.145 g, 0.351 mmol) 1-methylpiperizine (0.105 g, 1.052 mmol) and N-methylpyrrolidine (2.99 mg, 0.035 mmol) in dioxane (3 mL) was heated at 80° C. overnight, cooled to RT, concentrated to dryness and purified via silica gel chromatography (MeOH/DCM) to afford 4-methyl-N-(4-((6-(3-pivaloylureido)pyridin-3-yl)oxy)pyridin-2-yl)piperazine-1-carboxamide (60 mg, 38%). 1H NMR (400 MHz, DMSO-d6): δ 11.22 (s, 1H), 10.44 (s, 1H), 9.25 (s, 1H), 8.23 (d, J=2.9 Hz, 1H), 8.12 (d, J=5.7 Hz, 1H), 8.08 (d, J=9.0 Hz, 1H), 7.71 (dd, J=9.0, 2.9 Hz, 1H), 7.36 (d, J=2.4 Hz, 1H), 6.61 (dd, J=5.7, 2.4 Hz, 1H), 3.39 (m, 4H), 2.24 (m, 4H), 2.14 (s, 3H), 1.21 (s, 9H); MS (ESI) m/z: 456.2 (M+H+).

1. concentrationconcentrated to dryness
2. custompurified via silica gel chromatography (MeOH/DCM)