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Triethylamine (253 mg) was added to a solution of 1-{[4-ethoxycarbonylamino-1-(2-methyl-4-pyridyl)-4-piperidinyl]methyl}-2-piperazinone hydrochloride (258 mg) in dichloromethane (15 ml), 6-chloronaphthalene-2-sulfonyl chloride (196 mg) was added thereto at 0° C., and the mixture was stirred at room temperature for 1 hour. To the reaction solution was added an aqueous sodium carbonate solution, the mixture was extracted with dichloromethane, dried, concentrated, and purified by column chromatography (dichloromethane:10% aqueous ammonia-containing methanol=20:1) to obtain the colorless amorphous title compound (255 mg).

1. additionwas added
2. extractionthe mixture was extracted with dichloromethane
3. customdried
4. concentrationconcentrated
5. custompurified by column chromatography (dichloromethane:10% aqueous ammonia-containing methanol=20:1)