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:
Oct. 30, 2007
Filed:
Nov. 25, 2003
Applicants:
Jin Wan Kim, Seoul, KR;
Kwang DO Choi, Anyang, KR;
Jee Woong Lim, Gunpo, KR;
Kwang Hyeg Lee, Sungnam, KR;
Sang Ho Lee, Anyang, KR;
Inventors:
Jin Wan Kim, Seoul, KR;
Kwang Do Choi, Anyang, KR;
Jee Woong Lim, Gunpo, KR;
Kwang Hyeg Lee, Sungnam, KR;
Sang Ho Lee, Anyang, KR;
Assignee:
CJ Corporation, Seoul, KR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D 401/00 (2006.01); C07D 405/00 (2006.01); C07D 403/00 (2006.01); C07D 409/00 (2006.01); C07D 411/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
Provided is a method for preparing oltipraz. The method includes reacting methyl 2-methyl-3-(pyrazin-2-yl)-3oxopropionate with phosphorus pentasulfide in the presence of a mixed solvent of toluene and xylene, followed by recrystallization.