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. 28, 2014
Filed:
Apr. 10, 2013
Applicant:
Ranbaxy Laboratories Limited, New Delhi, IN;
Inventors:
Dattatray Bapuso Patil, Kolhapur, IN;
Killol Patel, Junagadh, IN;
Ashok Prasad, New Delhi, IN;
Mohan Prasad, Gurgaon, IN;
Assignee:
Ranbaxy Laboratories Limited, New Delhi, IN;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D 209/16 (2006.01); C07D 241/36 (2006.01); C07D 307/80 (2006.01); C07D 471/12 (2006.01); C07D 471/14 (2006.01); C07D 471/04 (2006.01);
U.S. Cl.
CPC ...
C07D 471/14 (2013.01); C07D 471/12 (2013.01); C07D 471/04 (2013.01);
Abstract
The present invention relates to a process for the preparation of tadalafil of Formula I, comprising reacting a D-tryptophan compound of Formula III with piperonal in sulfolane.