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:
Sep. 26, 2006
Filed:
Apr. 17, 2002
Gwan-sun Lee, Seoul, KR;
Young-kil Chang, Seoul, KR;
Hong-sun Kim, Seoul, KR;
Jae-heon Lee, Yongin-si, KR;
Chul-hyun Park, Seongnam-si, KR;
Gha-seung Park, Goyang-si, KR;
Cheol-kyung Kim, Namyangju-si, KR;
Gwan-Sun Lee, Seoul, KR;
Young-Kil Chang, Seoul, KR;
Hong-Sun Kim, Seoul, KR;
Jae-Heon Lee, Yongin-si, KR;
Chul-Hyun Park, Seongnam-si, KR;
Gha-Seung Park, Goyang-si, KR;
Cheol-Kyung Kim, Namyangju-si, KR;
Hanmi Pharm. Co., Ltd., , KR;
Abstract
A 3-(Z)-propenyl cephem compound is selectively prepared by reacting a phosphoranylidene cephem compound with acetaldehyde in the presence of a base in a solvent mixture comprising diethyl ether, formula (I), wherein R is a carboxyl protecting group; Ris hydrogen or RCHCO—; and Ris ethyl, 2-thiophenyl, phenyl, p-hydroxyphenyl or phenoxy