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US 7,115,744 B2Granted
Method for producing 8-methoxy-quinolinecarboxylic acids
AssigneeBayer HealthCare LLC
InventorsReinhold Gehring, Klaus Mohrs, Werner Heilmann, Herbert Diehl
Life of this patent
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Abstract
The present invention relates to a novel process for preparing 8-methoxy-3-quinolonecarboxylic acids which are antibiotics having potent antibacterial action.
Claims5
A process for preparing
- comprising reacting
- with methanol and potassium tert-butoxide in tetrahydrofuran as solvent and further comprising (a) adding dilute hydrochloric acid to the reaction mixture or adding the reaction mixture to dilute hydrochloric acid;
- and (b) isolating the precipitated hydrochloride by filtration to obtain
Dependencies are inferred from the claim text.