Citric Acid → N-(5-((2-(2,6-cis-Dimethylpiperidin-1-yl)ethyl)carbamoyl)-2-fluorophenyl)-7-(1-methyl-1H-pyrazol-5-yl)imidazo[1,2-a]pyridine-3-carboxamide Citric Acid

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반응 단계

7-(2-Methyl-2H-pyrazol-3-yl)-imidazo[1,2-a]pyridine-3-carboxylic acid {5-[2-(2,6-dimethyl-piperidin-1-yl)-ethylcarbamoyl]-2-fluoro-phenyl}-amide (step 3) (480 g) was suspended in ethanol (2300 mL) in a 5000 mL four-necked flask equipped with thermometer, reflux condenser and a nitrogen inlet. The mixture was heated to 55° C. and the suspension gradually became clear. A solution of citric acid (180 g) in acetone (2.4 L) was added over 1 h and the internal temperature was controlled at 45-50° C. The clear solution was stirred at 50° C. for 2 h. A crystal seed (1 g) was added to the reactor and the internal temperature was cooled to 20° C. at a speed of 8° C./h. The mixture was stirred at 20° C. for 60 h. The resulting solid was filtered and the filter cake was washed with acetone (1 L) and dried in vacuum (under 4 mbar at 55° C.) for 24 h to afford the title compound;

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