KR880006227A - Process for preparing quinolone carboxylic acid derivative - Google Patents

Abstract

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Description

Process for preparing quinolone carboxylic acid derivative

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Claims (3)

A quinoline carboxylic acid derivative of formula (I) wherein the following compound of formula (III) is converted to a compound of formula (II) by diazonium tetra fluoride boronation in an aqueous solution and thermally decomposed in a nonpolar solvent, or How to prepare a salt. R ₁ is hydrogen, a lower alkyl group having 1 to 4 carbon atoms, an alkoxy carbonyl group, an acetyl group, R ₂ is a lower alkyl group having 1 to 3 carbon atoms, a cyclopropyl group, and R ₃ is hydrogen, a lower alkyl group having 1 to ₃ carbon atoms. The process according to claim 1, wherein the compound of formula II is pyrolyzed at 80-200 ° C. The method of claim 1, wherein when R ₁ in the compound of formula (III) is hydrogen, it is protected by an alkoxy carbonyl group or an acetyl group, and then a diazonium tetra fluoride boronation method is used to prepare the compound of formula (II). ※ Note: The disclosure is based on the initial application.