Water → 2-(2-ethyl-5,7-dimethyl-3H-imidazo[4,5-b]pyridin-3-yl)methyl-10,11-dihydro-5H-dibenzo[b,f]azepine

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Reaction Steps

[step 1] 2-Ethyl-5,7-dimethyl-3H-imidazo[4,5-b]pyridine (U.S. Pat. No. 5,332,744; 36.55 g, 209 mmol) was dissolved in DMF (365.5 mL), and the solution was added with lithium hydroxide (5.62 g, 235 mmol), followed by stirring at room temperature for 15 min. 1-(10,11-Dihydro-5H-dibenzo[b,f]azepin-2-ylmethyl)-1-methylpiperidinium iodide (JP-A-7-61983; 95.0 g, 219 mmol) and DMF (73.1 mL) were added thereto, and the mixture was stirred at 40° C. for 8 hr. After cooling to room temperature, water (175.4 mL) was added dropwise, and the mixture was stirred under ice-cooling for 2 hr. The precipitate was collected by filtration, and dissolved in chloroform (520 mL) with heating. Activated carbon (5.2 g) was added, and the mixture was stirred for 30 min with heating, and the hot solution was filtered. Ethyl acetate (1041 mL) was added to the filtrate, and the precipitate was collected by filtration to give 2-(2-ethyl-5,7-dimethyl-3H-imidazo[4,5-b]pyridin-3-yl)methyl-10,11-dihydro-5H-dibenzo[b,f]azepine (36.7 g, 46%).

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