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:
Jun. 12, 1990
Filed:
Sep. 09, 1988
Applicant:
Inventors:
Edward P Tiley, Pinner, GB;
Michael V Ramsay, South Harrow, GB;
Assignee:
American Cyanamid Company, Stamford, CT (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
549264 ;
Abstract
A process is described for preparing a compound of formula (I) ##STR1## (in which R.sup.1 represents a methyl, ethyl or isopropyl group, R.sup.2 represents a hydrogen atom or a methyl or acetyl group and R.sup.3 represents a hydrogen atom, or OR.sup.2 and R.sup.3 together with the carbon atom to which they are attached represent the group >C.dbd.0) which comprises treating a corresponding 23.alpha.- compound with a triethyloxonium salt.