Potassium Carbonate → N-(2-oxo-8-(2-oxopyrrolidin-1-yl)-1-(thiophen-3-ylmethyl)-1,2,3,4-tetrahydroquinolin-3-yl)acetamide

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Methyl ethyl ketone (5 mL) was added to a mixture of N-(2-oxo-8-(2-oxopyrrolidin-1-yl)-1,2,3,4-tetrahydroquinolin-3-yl)acetamide (500 mg) and potassium carbonate powder (265 mg), and 3-(bromomethyl)thiophene was added thereto. The mixture was stirred at an internal temperature of 79° C. for 20.5 hours, and then left to stand at room temperature. The mixture was partitioned between saturated aqueous sodium chloride solution (2 mL) and ethyl acetate (1 mL), and the aqueous layer was extracted with ethyl acetate (2 mL+1 mL). The organic layers were combined, and the solvent was evaporated under reduced pressure. Ethyl acetate (1.5 mL) and toluene (2.5 mL) were added to the thus-recovered residue, and the precipitated crystals were recovered through filtration. The container of the reaction mixture was washed with a mixture of ethyl acetate and toluene (3:5) (0.5 mL×2). The thus-recovered crystals were washed with a mixture of ethyl acetate and toluene (3:5) (1.0 mL×2), and then dried under reduced pressure at 60° C., whereby ethyl acetate solvates of the title compound (510 mg) were yielded.

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