Acetonitrile → Azetidine urea derivative 2

To a solution consisting of 3-{2-[3-(4-chloro-phenoxy)-phenoxy]-ethyl}-azetidine formic acid salt (0.040 g, 0.13 mmol), TEA (0.018 mL, 0.13 mmol) and CH3CN (1.0 mL) was added imidazo[1,2-b]pyridazin-3-yl-carbamic acid phenyl ester (0.034 g, 0.13 mmol). The reaction mixture was stirred at room temperature for 16 h, then diluted with EtOAc (40 mL) and washed with saturated aq. NaHCO3 (40 mL). The organic layer was dried (Na2SO4) and concentrated. The crude residue was purified (FCC) to give the title compound (0.035 g, 57%). MS (ESI+): calcd. for C24H22ClN5O3, 463.14. m/z found, 464.1 (M+H)+. 1H NMR (d6-DMSO): 8.55 (s, 1H), 8.52 (d, J=4.4 Hz, 1H), 8.06 (d, J=9.2 Hz, 1H), 7.64 (s, 1H), 7.43 (d, J=7.3 Hz, 2H), 7.29 (t, J=8.2 Hz, 1H), 7.19-7.15 (m, 1H), 7.04 (d, J=7.4 Hz, 2H), 6.75 (d, J=8.3 Hz, 1H), 6.61-6.55 (m, 2H), 4.09 (t, J=8.1 Hz, 2H), 3.99 (t, J=6.1 Hz, 2H), 3.77-3.66 (m, 2H), 2.83-2.69 (m, 1H), 2.10-2.01 (m, 2H).