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. 04, 2006
Filed:
Jul. 17, 2003
Manne Satyanarayana Reddy, Hyderabad, IN;
Chakilam Nagaraju, Secunderabad, IN;
Gudipati Srinivasulu, Hyderabad, IN;
Mandava Venkata Naga Brahmeshwar Rao, Hyderabad, IN;
Bojja Ramachandra Reddy, Hyderabad, IN;
Singamsetty Radhakrishna, Hyderabad, IN;
Manne Satyanarayana Reddy, Hyderabad, IN;
Chakilam Nagaraju, Secunderabad, IN;
Gudipati Srinivasulu, Hyderabad, IN;
Mandava Venkata Naga Brahmeshwar Rao, Hyderabad, IN;
Bojja Ramachandra Reddy, Hyderabad, IN;
Singamsetty Radhakrishna, Hyderabad, IN;
Dr. Reddy's Laboratories, Limited, Hyderabad, IN;
Dr. Reddy's Laboratories, Inc., Bridgewater, NJ (US);
Abstract
A crystalline Form II of 17β-N-[2,5-bis (trifluoromethyl)phenyl]carbamoyl-4-aza-5-α-androst-1-en-3-one (dutasteride) is provided. The preferred crystalline Form II of dutasteride has an X-ray powder diffraction pattern, expressed in terms of d-spacing (in ° A), with peaks at about 13.42, 6.96, 6.13, 5.27, 4.77, 4.70, 4.58, 4.46 and 3.82. A process for preparation of a crystalline Form II of dutasteride is also provided and includes dissolving a crude form of dutasteride in an alcoholic solvent having from 1 to 5 carbon atoms; removing the alcoholic solvent to obtain a residue; adding an ester solvent to the residue; and filtering the resulting separated solids. The processes of the invention are believed to be simple, eco-friendly, and commercially viable.