Cesium carbonate → Ethyl 8-[(3-fluoropyridin-2-yl)methoxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxylate

Participants

Reaction Conditions

Reaction Steps

15.78 g (86.7 mmol) of 2-(chloromethyl)-3-fluoropyridine hydrochloride (commercially available; additionally described in: U.S. Pat. No. 5,593,993 A1, 1997; WO2007/2181 A2, 2007) and 94.06 g (288.9 mmol) of caesium carbonate were added to 16.92 g (72.2 mmol) of ethyl 8-hydroxy-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxylate from Example 87A in 956 ml of DMF. The reaction mixture was stirred at 60° C. overnight. The reaction mixture was cooled to RT and filtered, the filtercake was washed with ethyl acetate and the filtrate was concentrated. About 500 ml of water were added to the residue and the precipitated solid was filtered off and dried under high vacuum. This gave 24.1 g (93% of theory) of the target compound.

Provenance & Evidence