Ethyl 7-chloro-1-cyclopropyl-6-fluoro-4-oxo-1,4-dihydro-1,8-naphthyridine-3-carboxylate, cas is 96568-07-9, it is a common heterocyclic compound, the naphthyridine compound, its synthesis route is as follows.
(1) 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, 745 mg of 5-acetamidomethylisoindoline, 0.56 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 260 mg of 7-(5- acetamidomethyl-2-isoindolinyl)-1-cyclopropyl-6-fluoro-1,4- dihydro-4-oxo-1,8-naphthyridine-3-carboxylic acid ethyl ester.
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Reference£º
Patent; Wakunaga Seiyaku Kabushiki Kaisha; US5026856; (1991); A;,
1,8-Naphthyridine – Wikipedia
1,8-Naphthyridine | C8H6N2 – PubChem