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. 25, 2019
Filed:
Jul. 18, 2018
Applicant:
Xi'an Taikomed Pharmaceutical Technology Co., Ltd., Xi'an, CN;
Inventors:
Yonghong Tang, Xi'an, CN;
Minghui Chang, Xi'an, CN;
Chengyuan Liang, Xi'an, CN;
Danni Tian, Xi'an, CN;
Juan Xia, Xi'an, CN;
Kaiqi Shi, Xi'an, CN;
Han Li, Xi'an, CN;
Xuechuan Wang, Xi'an, CN;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D 239/50 (2006.01); A61P 35/02 (2006.01);
U.S. Cl.
CPC ...
C07D 239/50 (2013.01); A61P 35/02 (2018.01); C07B 2200/13 (2013.01);
Abstract
A method of preparing 6-chloro-5-nitro-2,4-diaminopyrimidine includes: reacting guanidine hydrochloride with ethyl carbamoylacetate and sodium hypochlorite in the presence of a metal nitrate salt and acetate anhydride in an organic solvent.