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:
Mar. 04, 2003
Filed:
Jun. 06, 2002
Ivan Villax, Lisbon, PT;
Zita Mendes, Lisbon, PT;
Horione Limited, , HK;
Abstract
A process for the preparation of high purity flumethasone in high yield involves C3 protecting 9,11&bgr;-epoxy-17&agr;,21-dihydroxy-16&agr;-methylpregna-1,4-diene-3,20-dione,21-acetate, fluorinating at 6&agr;, removing the C3 protecting group, fluorinating the 9,11-epoxy group. The resulting flumethasone 21-acetate is treated with the methanolic potassium hydroxide in the presence of an oxidation agent, causing a simultaneous hydrolyzation and degradative oxidation, resulting in the formation of 6&agr;,9&agr;-difluoro-11&bgr;,17&agr;-dihydroxy-16&agr;-methyl-17&bgr;-carboxy-androsta-1,4-diene-3-one in high yield. Flumethasone 21-acetate is alternatively hydrolyzed to yield flumethasone free alcohol.