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:
Apr. 25, 1995
Filed:
May. 19, 1993
Norbert Krass, Frankfurt am Main, DE;
Elisabeth Defossa, Idstein/Taunus, DE;
Gerd Fischer, Limburg, DE;
Uwe Gerlach, Frankfurt am Main, DE;
Rolf Hoerlein, Frankfurt am Main, DE;
Rudolf Lattrell, Koenigstein/Taunus, DE;
Adolf H Linkies, Frankfurt am Main, DE;
Wolfgang Martin, Kelkheim/Taunus, DE;
Ulrich Stache, Hofheim am Taunus, DE;
Theodor Wollmann, Hofheim am Taunus, DE;
Hoechst Aktiengesellschaft, Frankfurt am Main, DE;
Abstract
The present invention relates to a process for the preparation of 7-amino-3-methoxymethylceph-3-em-4-carboxylic acid (I) from 7-amino-3-methoxymethylceph-3-em-4-carboxylic acid esters (II) or their salts by ester cleavage. The process comprises treating the compound II with formic acid, trifluoroacetic acid, methanesulfonic acid or trifluoromethanesulfonic acid or a mixture of two of these acids in each case.