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:
May. 10, 2005
Filed:
Dec. 20, 2000
Applicants:
Orlin Petrov, Berlin, DE;
Thomas Heiner, Berlin, DE;
Herribert Neh, Berlin, DE;
Martin Kruger, Berlin, DE;
Inventors:
Orlin Petrov, Berlin, DE;
Thomas Heiner, Berlin, DE;
Herribert Neh, Berlin, DE;
Martin Kruger, Berlin, DE;
Assignee:
Other;
Primary Examiner:
Int. Cl.
CPC ...
C07D401/06 ; C07D403/06 ;
U.S. Cl.
CPC ...
Abstract
A process for the production of 4-(heteroaryl-methyl)-halogen-1(2H)-phthalazinones, especially 4-(4-pyridylmethyl)-1(2H)-phthalazinone, is described, which is characterized by the reaction of phthalidyl-3-triphenylphosphonium salt with 4-pyridine aldehyde in the presence of a basic adjuvant, subsequent reaction with hydrazine hydrate and subsequent acid treatment, whereby this process avoids the technical safety and environmental problems of the known processes.