- Chemical synthesis method for norfloxacin
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The invention discloses a chemical synthesis method for norfloxacin. The chemical synthesis method comprises the following steps: (1) synthesis of a compound ethyl quinolinate: 3-ethylamino-2-(2,4-dichloro-5-fluorobenzoyl) ethyl acrylate is dissolved in DMF, potassium carbonate is added, the mixture is heated to 50-80 DEG C, reacts and stands overnight, a product is cooled and poured into cold water, produced solids are filtered, solids are washed with a large amount of water, and the product ethyl quinolinate is obtained; (2) synthesis of a compound quinolinic acid: ethyl quinolinate is dissolved in methanol, hydrochloric acid is added in a ratio being 1:1, reflux is performed for 2 h, white solids are precipitated and filtered, a filter product is washed with water and dried in a vacuum oven for 2 h, and the product quinolinic acid is obtained. The design is reasonable, and one novel norfloxacin synthesis method is selected and has good market application value.
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- N-ETHYLATION OF QUINOLINECARBOXYLIC ACIDS DERIVATIVES
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Phase-transfer catalysts were used in the reaction of synthesis of quinolones - new antibacterial agents. Keywords: Phase-transfer catalysis, N-ethylation, ethyl 7-chloro-6-fluoro-1-ethyl-1,4-dihydro-4-oxoquinoline-3-carboxylate.
- Kazimierczak, Jerzy,Kroszczynski, Wojciech,Gorecki, Bartlomiej,Smolinska, Jadwiga
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p. 365 - 368
(2007/10/02)
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- 7-(substituted)piperazinyl-1-ethyl-6-fluoro-1,4-dihydro-4-oxo-3-quinolinecarboxylic acids
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7-(substituted)piperazinyl-1-ethyl-6-fluoro-4-oxo-3-quinolinecarboxylic acids, the pharmacologically acceptable salts thereof, compositions containing them, processes and intermediates for producing them, and methods of using them to treat bacterial infections in warm-blooded animals.
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- Cycloaracylation of Enamines, I. - Synthesis of 4-Quinolone-3-carboxylic Acids
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Starting with o-halobenzoyl chlorides 4 and open-chain secondary enamines 5, a new synthesis of 4-quinolone-3-carboxylic acids 12 is described.The reaction of 7-haloquinolone-3-carboxylic acids 12a-k with aliphatic amines 14 produces highly active antibacterial 7-aminoquinolone-3-carboxylic acids 15.The main product of the 1-cyclopropyl series, "ciprofloxacin" (15a), is being developed as a broad-spectrum chemotherapeutic agent.
- Grohe, Klaus,Heitzer, Helmut
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