Tetrahydrofuran → (2-{5-[8-(1-Ethyl-propyl)-2,6-dimethyl-imidazo[1,2-b]pyridazin-3-yl]-4-methyl-thiophen-2-yl}-pyrrol-1-yl)-dimethyl-amine

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Reaction Steps

To a 0° C. solution 1-(dimethylamino)-pyrrole (0.24 mL, 2.04 mmol) and THF (4 mL) is added 1.24 M n-BuLi (1.73 mL, 2.14 mmol). The solution is warmed to ambient temperature and stirred for two hours. 0.5 M ZnCl2 (4.28 mL, 2.14 mmol) is added and the solution is stirred for one hour. 3-(5-Bromo-3-methyl-thiophen-2-yl)-8-(1-ethyl-propyl)-2,6-dimethyl-imidazo[1,2-b]pyridazine (0.40 g, 1.02 mmol) and PdCl2(dppf) (0.037 g, 0.051 mmol) is added and the solution is heated at 65° C. overnight. The solution is diluted with EtOAc (30 mL), washed with sat. NH4Cl (30 mL), dried over MgSO4, filtered and concentrated. The residue is purified by ISCO flash chromatography (15%-20% EtOAc gradient) furnish the title compound (0.41 g, 0.97 mmol, 95%). 1H NMR (CDCl3) δ 0.87 (t, J=7.5 Hz, 6H), 1.73-1.91 (m, 4H), 2.11 (s, 3H), 2.51 (s, 6H), 2.83 (s, 6H), 3.29-3.39 (m, 1H), 6.18-6.21 (m, 1H), 6.35 (dd, J=4.0, 1.8 Hz, 1H), 6.65 (s, 1H), 6.98 (dd, J=4.0, 1.8 Hz, 1H), 7.25 (s, 1H). LC/MS (m/z): calcd. for C24H31N5S (M+H)+: 422.2; found: 422.4.

Provenance & Evidence