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:
Jun. 24, 2008
Filed:
Sep. 18, 2003
Jozsef Neu, Budapest, HU;
Tibor Gizur, Budapest, HU;
Jozsef Törley, Budapest, HU;
Janos Csabai, Budapest, HU;
Ferenc Vegh, Esztergom, HU;
Peter Kalvin, Esztergom-Kertvaros, HU;
Gabor Tarkanyi, Budaors, HU;
Jozsef Neu, Budapest, HU;
Tibor Gizur, Budapest, HU;
Jozsef Törley, Budapest, HU;
Janos Csabai, Budapest, HU;
Ferenc Vegh, Esztergom, HU;
Peter Kalvin, Esztergom-Kertvaros, HU;
Gabor Tarkanyi, Budaors, HU;
Richter Gedeon Vegyeszeti Gyar. RT., Budapest, HU;
Abstract
The present invention relates to a new process for the synthesis of high purity 3,5-diamino-6-(2,3-dichlorophenyl)-1,2,4-triazine of formula (I) using 2,3-dichlorobenzoyl cyanide and an aminoguanidine salt as starting materials. 2,3-dichlorobenzoyl cyanide is reacted with 1-2 mol equivalent of aminoguanidine salt in 3-6 mol equivalent of methanesulfonic acid, then the obtained adduct of formula (IV) is transformed without isolation into the product with magnesium oxide. In given case the obtained crude product can be recrystallized from a proper organic solvent