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:
Jun. 16, 2015
Filed:
Dec. 27, 2012
Applicant:
Dr. Reddy's Laboratories Limited, Hyderabad, IN;
Inventors:
Pranab Haldar, Nutanbazar, IN;
Venkateswarlu Muvva, Hyderabad, IN;
Anil Kumar Prataprao, Visakhapatnam, IN;
Vijaya Kumar Karri, Kakinada, IN;
Bhanu Pratap Taduri, Hanamkonda, IN;
Venkateshwara Natraj Birudaraju, Warangal, IN;
Assignee:
DR. REDDY'S LABORATORIES LIMITED, HYDERABAD, IN;
Primary Examiner:
Int. Cl.
CPC ...
C07D 473/04 (2006.01); A61K 31/522 (2006.01);
U.S. Cl.
CPC ...
A61K 31/522 (2013.01); C07D 473/04 (2013.01);
Abstract
The present application provides a process for preparation of Linagliptin reacting (R)-piperidine-3-amine of Formula II or an acid addition salt thereof with 1-[(4-methyl-quinazolin-2-yl)methyl]-3-methyl-7-(2-butyn-1-yl)-8-bromoxanthine of Formula III in the presence of a suitable base in an inert organic solvent.