Reaktion #1391

Reaktionsgleichung

1-cyclopropyl-6-fluoro-7-bromo-5-methyl-1,4-dihydro-4-oxoquinoline-3-carboxylic acid

4-oxopiperidine

→

1-cyclopropyl-6-fluoro-7-(4-oxo-1-piperidinyl)-5-methyl-1,4-dihydro-4-oxoquinoline-3-carboxylic acid

Ausbeute 37.6%

Lösungsmittel

N-methyl-2-pyrrolidone

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.DISTILLATIONThe solvent is distilled off under reduced pressure
2. 2
   workup.ADDITIONTo the resulting residue is added ethanol
3. 3
   Filtrationthe precipitated crystals are filtered

Vorschrift

To a solution of 1-cyclopropyl-6-fluoro-7-bromo-5-methyl-1,4-dihydro-4-oxoquinoline-3-carboxylic acid (0.58 g) in N-methyl-2-pyrrolidone (5 ml) is added 4-oxopiperidine (0.64 g) and the mixture is heated at 90° C. for 20 minutes. The solvent is distilled off under reduced pressure. To the resulting residue is added ethanol and the precipitated crystals are filtered to give 1-cyclopropyl-6-fluoro-7-(4-oxo-1-piperidinyl)-5-methyl-1,4-dihydro-4-oxoquinoline-3-carboxylic acid (230 mg).

Quelle