反应详情

A mixture of 310 mg of 1-cyclopropyl-6-fluoro-7- chloro-1,4-dihydro-4-oxo-1,8-naphthyridine-3-carboxylic acid ethyl ester, 524 mg of 4-(t-butyloxycarbonylaminomethyl)isoindoline, 0.42 ml of triethylamine, and 5 ml of anhydrous chloroform was heated at 60°-70° C. for 0.5 hours while stirring. The resulting reaction mixture was diluted with 25 ml of chloroform. The mixture was washed with 5% acetic acid and brine in this order, dried over anhydrous sodium sulfate, and condensed. The residue was crystallized by the addition of ethylether. The crystals were collected by filtration and recrystallized from a mixed solvent of chloroform, methanol, and ethanol to obtain 417 mg of 7-[4- (t-butoxycarbonylaminomethyl)-2-isoindolinyl]-1-cyclopropyl-6-fluoro-1,4-dihydro-4-oxo-1,8-naphthyridine-3-carboxylic acid ethyl ester.

1. temperaturewas heated at 60°-70° C. for 0.5 hours
2. customThe resulting reaction mixture
3. washThe mixture was washed with 5% acetic acid and brine in this order
4. dry with materialdried over anhydrous sodium sulfate, and condensed
5. customThe residue was crystallized by the addition of ethylether
6. filtrationThe crystals were collected by filtration
7. customrecrystallized from a mixed solvent of chloroform, methanol, and ethanol