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:
Sep. 14, 1993
Filed:
Mar. 18, 1992
Applicant:
Inventors:
Peter T Meinke, New York, NY (US);
Helmut Mrozik, Matawan, NJ (US);
Assignee:
Merck & Co., Inc., Rahway, NJ (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
A61K / ; A61K / ;
U.S. Cl.
CPC ...
514 30 ; 514450 ; 536-71 ; 549264 ;
Abstract
Avermectin analogs are prepared where the 23-position ring carbon atom is deleted and replaced by an oxygen atom. The compounds are prepared by opening the outer spiroketal ring to gain access to the 23-position atom, substituting the ring-opened compounds with a substituent containing the oxygen atom in the appropriate position and closing the ring to prepare the desired compounds. The compounds are potent anthelmintic agents and methods and compositions including such 23-nor-23-oxa compounds are also disclosed.