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:
Nov. 23, 1976
Filed:
Jan. 20, 1975
Julius Schmidlin, Basel, CH;
Michel Biollaz, Basel, CH;
Ciba-Geigy Corporation, Ardsley, NY (US);
Abstract
A new method for converting 11.beta.,18; 18,20-bis-epoxy-pregn-20-enes to 11.beta.,18-epoxy-18,21-dihydroxy-20-oxo-pregnane compounds or functional derivatives thereof is described and claimed. It consists in treating said bis-epoxy compounds with a heavy metal acylate having an acyloxylating action, such as lead - (IV), cerium - (IV), mercury - (II) and thallium - (III) - acylates. Preferred agent is lead tetraacetate. The reaction is conducted in a solvent or suspending agent like benzene or its homologs or chlorinated paraffins, like methylene chloride, preferably at room temperature and optionally in the presence of an acid. In the 21- acylates of 11.beta.,18-epoxy-18,21-dihydroxy-20-oxo-pregnane compounds thus obtained the 21-hydroxy group and any other protected functional groups can be set free in manner known. The process is especially important for the manufacture of aldosterone or its derivatives.