The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 13, 2001
Filed:
Oct. 24, 2000
Applicant:
Inventors:
Young-Jun Park, Taejon, KR;
Ho-Seong Lee, Taejon, KR;
Min-Hwan Kim, Taejon, KR;
Kyung-Chul Kim, Ulsan, KR;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D / ; C07D / ;
U.S. Cl.
CPC ...
C07D / ; C07D / ;
Abstract
Disclosed is a process for preparing optically active (−)pyridobenzoxazine carboxylic acid derivative and pharmaceutically acceptable salt thereof by employing a starting material of (+)ethyl 2-(4-chloro-5-fluoro-2-halo-3-nitobenzoyl)-3-[(1-hydroxypropy-2(s)-yl)amino]acrylate. According to the present invention, optically active (−)pyridobenzoxazine carboxylic acid derivative can be manufactured from low-priced 4-chloro-5-fluorobenzoic acid derivative in a simple and economical manner.