反应详情

A mixture of ethyl 7-(p-tolylsulfonyl)-1-cyclopropyl-6-fluoro-1,4-dihydro-4-oxo-1,8-naphthyridine-3-carboxylate (800 mg), 3-acetylaminopyrrolidine (300 mg), triethylamine (236 mg), and ethanol (25 ml) was refluxed for 2 hours. After evaporation of the solvent under reduced pressure, the residual crude crystals were recrystallized from ethanol-isopropyl ether to give ethyl 7-(3-acetylamino-1-pyrrolidinyl)-1-cyclopropyl-6-fluoro-1,4-dihydro-4-oxo-1,8-naphthyridine-3-carboxylate (600 mg), m.p. 246°-248° C.

1. temperaturewas refluxed for 2 hours
2. customAfter evaporation of the solvent under reduced pressure
3. customthe residual crude crystals were recrystallized from ethanol-isopropyl ether