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:
Aug. 01, 2006
Filed:
Aug. 13, 2003
Applicants:
Young-ho Moon, Suwon-si, KR;
Kyung-ik Lee, Anyang-si, KR;
Gha-seung Park, Yongin-si, KR;
Chul-hyun Park, Seongnam-si, KR;
Jae-cheol Lee, Suwon-si, KR;
Gwan-sun Lee, Seoul, KR;
Young-kil Chang, Seoul, KR;
Inventors:
Young-Ho Moon, Suwon-si, KR;
Kyung-Ik Lee, Anyang-si, KR;
Gha-Seung Park, Yongin-si, KR;
Chul-Hyun Park, Seongnam-si, KR;
Jae-Cheol Lee, Suwon-si, KR;
Gwan-Sun Lee, Seoul, KR;
Young-Kil Chang, Seoul, KR;
Assignee:
Hanmi Pharm. Co., Ltd., Kyungki-do, KR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D 221/18 (2006.01); C07D 221/02 (2006.01);
U.S. Cl.
CPC ...
Abstract
This invention relates to a method for selectively preparing the 3-oxo-4-aza-5¥á-androstane compound which is used as an intermediate of finasteride by heating 3-oxo-4-aza-5-androstene in a mixture of formic acid and an alkanediol in the presence of zinc.