Potassium Carbonate → 1-(2-fluoro-5-methoxy-4-((6-methoxypyridin-3-yl)methoxy)benzyl)-5-(4-methylpiperazin-1-yl)-1H-benzo[d]imidazole

Participants

Reaction Conditions

Reaction Steps

To a stirred suspension of 1-(2-fluoro-5-methoxy-4-((6-methoxypyridin-3-yl)methoxy)benzyl)-5-iodo-1H-benzo[d]imidazole (0.20 g, 0.39 mmol) in dimethyl sulfoxide (4 mL) was added 1-methylpiperazine (0.039 g, 0.39 mmol), copper(I) iodide (0.009 g, 0.046 mmol), potassium carbonate (0.19 g, 1.35 mmol), and L-proline (0.010 g, 0.092 mmol). The light yellow reaction mixture was heated to 120° C. After 16 h, the reaction mixture was allowed to cool to room temperature and was diluted with 3 N ammonium hydroxide solution (20 mL). The mixture was extracted with dichloromethane. The organic phase was washed with water (2×15 mL), brine, dried over magnesium sulfate, filtered, and concentrated. Chromatographic purification (CombiFlash, 40 g SiO2 column, 1-5% methanol/dichloromethane elute) provided 0.062 g of impure material. Subsequent re-purification via Prep-HPLC afforded 0.030 g (16%) of the product as a solid: 1H NMR (400 MHz, CDCl3) δ 8.19 (d, J=2.0 Hz, 1H), 7.88 (s, 1H), 7.65 (dd, J=8.5, 2.5 Hz, 1H) 7.33 (d, J=2.1 Hz, 1H), 7.29-7.22 (m, 2H), 7.07-6.99 (m, 1H), 6.78-6.69 (m, 2H), 6.56 (d, J=7.1 Hz, 1H), 5.30 (s, 2H), 5.00 (s, 2H), 3.94 (s, 3H), 3.69 (s, 3H), 3.25-3.18 (m, 4H), 2.71-2.59 (m, 4H), 2.39 (s, 3H) ppm; (M+1)=492.

Provenance & Evidence