Reaktion #76168

Reaktionsgleichung

methyl 1-cyclopropyl-7-chloro-6-fluoro-8-methoxy-1,4-dihydro-4-oxo-3-quinolinecarboxylate

acetate

sulfuric acid

→

1-cyclopropyl-7-chloro-6-fluoro-8-methoxy-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid

Ausbeute 92.0%

Lösungsmittel

water

Reaktionsbedingungen

Aufarbeitung

1. 1
   TemperaturThe resulting mixture was cooled
2. 2
   Filtrationfiltered
3. 3
   SonstigeThe precipitate was re-crystallized from choroform-ethanol

Vorschrift

28.6 g of methyl 1-cyclopropyl-7-chloro-6-fluoro-8-methoxy-1,4-dihydro-4-oxo-3-quinolinecarboxylate (0.088 mol), 160 ml of acetate acid, 100 ml of water and 18 ml of concentrated sulfuric acid were stirred for 40 minutes at 100-110° C. The resulting mixture was cooled and filtered. The precipitate was re-crystallized from choroform-ethanol to afford 25.2 g of 1-cyclopropyl-7-chloro-6-fluoro-8-methoxy-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid (Gaticarboxylic acid, 0.081 mol) in 91.8% yield, mp 195-199° C.

Quelle