1-{3-[8-(1-Ethyl-propyl)-2,6-dimethyl-imidazo[1,2-b]pyridazin-3-yl]-2-methyl-imidazo[1,2-a]pyridin-8-yl}-ethanone → 2-{3-[8-(1-Ethyl-propyl)-2,6-dimethyl-imidazo[1,2-b]pyridazin-3-yl]-2-methyl-imidazo[1,2-a]pyridin-8-yl}-propan-2-ol

Participants

Reaction Steps

A suspension of CeCl3 (0.37 g, 2.22 mmol) in THF (10 mL) is stirred at RT for 2 h. It is then cooled to 0° C., and treated with 3.0 M CH3MgBr (0.74 mL, 2.22 mmol). The mixture is stirred at 0° C. for 2 h. A solution of 1-{3-[8-(1-ethyl-propyl)-2,6-dimethyl-imidazo[1,2-b]pyridazin-3-yl]-2-methyl-imidazo[1,2-a]pyridin-8-yl}-ethanone (0.57 g, 1.48 mmol) in THF (5 mL) is added to the mixture at 0° C. The reaction is stirred at 0° C. for 30 min and at RT for 2 h. It is finally quenched with sat. NH4Cl (10 mL), diluted with H2O (50 mL); extracted with EtOAc (3×100 mL). The combined organic layers is dried with Na2SO4, filtered and concentrated. Purification of the crude material by silica gel chromatography gives the title compound (0.36 g, 0.90 mmol, 61%). 1H NMR (CDCl3): δ 0.92 (t, J=7.5 Hz, 3H), 0.93 (t, J=7.5 Hz, 3H), 1.80 (s, 6H), 1.80-1.95 (m, 4H), 2.41 (s, 3H), 2.42 (s, 3H), 2.45 (s, 3H), 3.31-3.41 (m, 1H), 6.67-6.74 (m, 1H), 6.73 (s, 1H), 6.92 (bs, 1H), 7.09 (bs, 1H), 7.41 (d, J=5.6 Hz, 1H) ppm. ES-MS (m/z): calcd for C24H31N5O (M+H)+: 406.6. found: 406.3.

Provenance & Evidence