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. 02, 1997
Filed:
Apr. 15, 1996
Applicant:
Inventors:
Reiner Ramert, Weiler bei Bingen, DE;
Rainer Sobotta, Ingelheim am Rhein, DE;
Assignee:
Boehringer Ingelheim KG, Ingelheim am Rhein, DE;
Primary Examiner:
Int. Cl.
CPC ...
C07D / ; C07B / ;
U.S. Cl.
CPC ...
544277 ;
Abstract
The present invention relates to a new and improved process for preparing 2-amino-6-chloropurine comprising the step of reacting guanine in the presence of ammonium sulphate with hexamethyldisilazane. The process of this invention advantageously results in a high yield of 2-amino-6-chloropurine and may be carried out on a laboratory or an industrial scale.