Nitrogen → 8-(1-Ethyl-propyl)-2,6-dimethyl-3-(3-methyl-5-pyrimidin-2-yl-thiophen-2-yl)-imidazo[1,2-b]pyridazine

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A solution of 3-(5-bromo-3-methyl-thiophen-2-yl)-8-(1-ethyl-propyl)-2,6-dimethyl-imidazo[1,2-b]pyridazine (0.30 g, 0.76 mmol), 2-tributylstannanyl-pyrimidine (0.34 g, 0.92 mmol) and THF (5 mL) is de-gassed with N2 for 10 minutes Triphenylarsine (0.047 g, 0.15 mmol) and Pd2(dba)3 (0.035 g, 0.038 mmol) is added and the solution heated at 55° C. for 48 hours and concentrated. The residue is purified by ISCO column chromatography (15%-30% EtOAc/hexane gradient), dissolved in acetonitrile (20 mL), washed with hexane (3×20 mL) and concentrated to furnished the title compound (0.097 g, 0.25 mmol, 32%). 1H NMR (CDCl3), δ 0.88 (t, J=7.4 Hz, 6H), 1.74-1.92 (m, 4H), 2.18 (s, 3H), 2.51 (s, 3H), 2.52 (s, 3H), 3.29-3.38 (m, 1H), 6.67 (s, 1H), 7.08 (t, J=4.8, 1H), 7.93 (s, 1H), 8.69 (s, 2H). LC/MS (m/z): calcd. for C22H25N5S (M+H)+: 392.3; found: 392.2.

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