Tetrahydrofuran → 2-[8-(1-Ethyl-propyl)-2,6-dimethyl-imidazo[1,2-b]pyridazin-3-yl]-5-pyridin-3-yl-thiophene-3-carbonitrile

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Reaction Steps

To a −78° C. solution of 3-iodo-pyridine (0.32 g, 1.56 mmol), 0.5 M ZnCl2 in THF (3.20 mL, 1.59 mmol), and THF (2 mL) is added 1.7 M t-BuLi (1.85 mL, 3.15 mmol). The solution is warmed to ambient temperature and stirred for 30 minutes. 5-Bromo-2-[8-(1-ethyl-propyl)-2,6-dimethyl-imidazo[1,2-b]pyridazin-3-yl]-thiophene-3-carbonitrile (0.21 g, 0.52 mmol) and Pd(PPh3)4 (0.03 g, 0.026 mmol) are added and the solution heated at 55° C. for 1 hour, cooled to ambient temperature and stirred overnight, diluted with EtOAc (50 mL), washed with sat. NH4Cl (2×40 mL), dried over MgSO4, filtered and concentrated. The residue is purified by ISCO column chromatography (15%-40% EtOAc/hexane gradient), furnish the title compound (0.15 g, 0.37 mmol, 71%). 1H NMR (CDCl3) δ 0.87 (t, J=7.5 Hz, 6H), 1.74-1.92 (m, 4H), 2.58 (s, 3H), 2.66 (s, 3H), 3.26-3.35 (m, 1H), 6.78 (s, 1H), 7.34-7.46 (m, 1H), 7.56 (s 1H), 7.91 (d, J=7.1 Hz, 1H), 8.62 (s, 1H), 8.91 (s, 1H). LC/MS (m/z): calcd. for C23H23N5S (M+H)+: 402.6; found: 402.4.

Provenance & Evidence