Pyridine → HCID 23071203, compound

Participants

Reaction Steps

To a solution of bis(trichloromethyl)carbonate (0.582 g) in tetrahydrofuran (20 mL) was added dropwise a solution of pyridine (0.485 mL) in tetrahydrofuran (1 mL) under ice-cooling. The reaction solution was stirred for 30 minutes under ice-cooling, and ethyl 2-(methylamino)ethyl carbonate hydrochloride (1.10 g) obtained in Reference Synthetic Example 14 was added thereto. A solution of triethylamine (0.84 mL) in tetrahydrofuran (1 mL) was added dropwise, and stirred at room temperature for 2.5 hrs. The reaction solution was concentrated under reduced pressure, and to the residue was added water (30 mL), and then extracted with ethyl acetate (80 mL). The ethyl acetate layer was washed with saturated brine (30 mL), and dried over anhydrous magnesium sulfate. The solution was concentrated under reduced pressure, and the residue was dissolved in tetrahydrofuran (20 mL). To the solution were added 5-methoxy-2-[[(4-methoxy-3,5-dimethyl-2-pyridyl)methyl]sulfinyl]-1H-imidazo[4,5-b]pyridine (1.44 g) synthesized by a method described in JP-A 63-146882, triethylamine (1.16 mL) and 4-dimethylaminopyridine (0.049 g), and stirred at 60° C. for 6 hrs. The reaction solution was concentrated under reduced pressure, and to the residue was added water (30 mL), and extracted with ethyl acetate (100 mL). The ethyl acetate layer was washed with saturated brine (30 mL), and dried over anhydrous magnesium sulfate. After concentrating under reduced pressure, the residue was purified with basic silica gel column chromatography (eluted with ethyl acetate:hexane=1:2, then 1:1). The purified material was crystallized from diethyl ether to give title compound as colorless solid (0.721 g).

Provenance & Evidence