反应详情

In 4 ml of methylene chloride was dissolved 270 mg of anhydrous piperazine, and 400 mg of ethyl 1-(2,4-difluorophenyl)-6-fluoro-1,4-dihydro-4-oxo-7-(2,4,6-triisopropylbenzenesulfonyloxy)-1,8-naphthyridine-3-carboxylate was added to the resulting solution, after which the resulting mixture was subjected to reaction with ice-cooling for 1 hour. To the reaction mixture were added 20 ml of ethyl acetate and 10 ml of water, and the organic layer was separated, washed successively with 10 ml of saturated aqueous sodium hydrogencarbonate solution and 10 ml of saturated aqueous sodium chloride solution, and then dried over anhydrous magnesium sulfate. The solvent was removed by distillation under reduced pressure, and to the crystalline material thus obtained was added 5 ml of diethyl ether, after which crystals were collected by filtration to obtain 250 mg (yield 91.2%) of ethyl 1-(2,4-difluorophenyl)-6-fluoro-1,4-dihydro-4-oxo-7-(1-piperazinyl)-1,8-naphthyridine-3-carboxylate having a melting point of 208°-211° C.

1. additionwas added to the resulting solution
2. customafter which the resulting mixture was subjected to reaction with ice-
3. temperaturecooling for 1 hour
4. customthe organic layer was separated
5. washwashed successively with 10 ml of saturated aqueous sodium hydrogencarbonate solution and 10 ml of saturated aqueous sodium chloride solution
6. dry with materialdried over anhydrous magnesium sulfate
7. customThe solvent was removed by distillation under reduced pressure
8. customto the crystalline material thus obtained
9. filtrationafter which crystals were collected by filtration