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. 26, 2010
Filed:
Nov. 04, 2005
Waldemar Pfrengle, Biberach, DE;
Thorsten Pachur, Schwendi, DE;
Thomas Nicola, Ingelheim, DE;
Adil Duran, Rissegg, DE;
Waldemar Pfrengle, Biberach, DE;
Thorsten Pachur, Schwendi, DE;
Thomas Nicola, Ingelheim, DE;
Adil Duran, Rissegg, DE;
Boehringer Ingelheim International GmbH, Ingelheim am Rhein, DE;
Abstract
The invention relates to an improved process for preparing enantiomerically pure 8-(3-aminopiperidin-1-yl)-xanthines. The process involves reacting a compound of the formula (III) with 3-(phthalimido)piperidine or an enantiomer thereof where X is a leaving group selected from halogens and sulphonic ester acid residues, and Rto Rare as defined herein, to obtain a compound of the formula (II) and deprotecting the obtained compound of the formula (II) to obtain the product xanthines.