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. 03, 2012
Filed:
Jun. 10, 2006
Applicants:
Michael Wessling, Kandern, DE;
Barbara Duecker, Mainz, DE;
Nicole Nitschke, Eschborn, DE;
Inventors:
Assignee:
Clariant Produkte (Deutschland) GmbH, Frankfurt, DD;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D 471/04 (2006.01);
U.S. Cl.
CPC ...
Abstract
The present invention relates to a process for the preparation of 3,7-diazabicyclo[3.3.1]nonane compounds. According to the invention, in a first step, a dicarboxylic acid ester is reacted with a pyridine aldehyde and a primary amine. The piperidone which forms is reacted in a second stage with formaldehyde and a further primary amine. It is essential to the invention that, in the first reaction stage, a C2-C4-alcohol is used as solvent and, in the second reaction stage, a C3-C4-alcohol is used as solvent.