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:
May. 04, 2010
Filed:
Jan. 09, 2007
Herbert Diehl, Leverkusen, DE;
Andreas Krebs, Odenthal, DE;
Elvira Krebs, Legal Representative, Odenthal, DE;
Walter Lange, Odenthal, DE;
Hanns-ingolf Paul, Leverkusen, DE;
Dietrich Seidel, Wuppertal, DE;
Rolf Grosser, Leverkusen, DE;
Tobias Reichelt, Köln, DE;
Herbert Diehl, Leverkusen, DE;
Andreas Krebs, Odenthal, DE;
Elvira Krebs, legal representative, Odenthal, DE;
Walter Lange, Odenthal, DE;
Hanns-Ingolf Paul, Leverkusen, DE;
Dietrich Seidel, Wuppertal, DE;
Rolf Grosser, Leverkusen, DE;
Tobias Reichelt, Köln, DE;
LANXESS Deutschland GmbH, Leverkusen, DE;
Abstract
The present invention relates to a process for the enantiomeric enrichment of cis-8-benzyl-7,9-dioxo-2,8-diazabicyclo[4.3.0]nonane with the aid of continuous countercurrent chromatography, which is also described as SMB chromatography (SMB=simulated moving bed). In a further aspect, the invention relates to a process for the preparation of (1S,6R)-8-benzyl-7,9-dioxo-2,8-diazabicyclo[4.3.0]nonane using the aforementioned process, which furthermore includes a racemization step.