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:
Feb. 20, 1996
Filed:
Jan. 25, 1994
Applicant:
Inventors:
Thomas Meng-Han Liu, Westfield, NJ (US);
Joseph E Lynch, Plainfield, NJ (US);
Ralph P Volante, Cranbury, NJ (US);
Assignee:
Merck & Co., Inc., Rahway, NJ (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C07D / ; A61K / ;
U.S. Cl.
CPC ...
540302 ; 540350 ;
Abstract
This invention relates to the synthesis of a bicyclic ketoester compound of the formula 1 obtained by cyclizing a diazo compound of formula 2: in the presence of a rhodium catalyst. ##STR1## By adding an effective amount of a Lewis acid to the cyclization reaction, the reaction selectively produces the 1-beta methyl isomer, and epimerization of the 1-beta methyl compound to the 1-alpha isomer is minimized.