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. 25, 1997
Filed:
May. 23, 1995
Applicant:
Inventors:
Rainer Sobotta, Ingelheim am Rhein, DE;
Rainer Schwarz, Ingelheim am Rhein, DE;
Manfred Psiorz, Ingelheim am Rhein, DE;
Assignee:
Boehringer Ingelheim KG, Ingelheim am Rhein, DE;
Primary Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
548486 ;
Abstract
The invention is directed to a process for preparing a 1,3-dialkyl-5-hydroxyoxindole of formula 1: ##STR1## comprising heating an N-alkyl-p-alkoxy-(.alpha.-haloacyl)anilide of formula 2: ##STR2## wherein the substituents are as defined herein, in the presence of an anhydrous zinc halide to a temperature in the range from about 120.degree. C. to about 160.degree. C., and isolating the 1,3-dialkyl-5-hydroxyoxindole prepared.