US Patent 7576214 Process for preparing 7-chloro-1-cyclopropyl-6-fluoro-4-oxo-1, 4-dihydro-1,8-naphthyridine-3-carboxylic acid

Patent 7576214 was granted and assigned to LG on August, 2009 by the United States Patent and Trademark Office.

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Patent

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Current Assignee

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

75762140

Patent Inventor Names

Kyu-Woong Lee0

Hyun-Ik Shin0

Jay-Hyok Chang0

Date of Patent

August 18, 2009

Patent Application Number

105726360

Date Filed

October 22, 2004

Patent Primary Examiner

‌

Janet L. Andres

Patent abstract

Starting from ethyl 3-(2,6-dichloro-5-fluoropyridin-3-yl)-3-oxo-propanoate (1), the present invention provides highly pure 7-chloro-1-cyclopropyl-6-fluoro-4-oxo-1,4-dihydro-1,8-naphthyridine-3-carboxylic acid (5) in one-pot four steps using a single solvent.

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