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. 07, 2017
Filed:
Jun. 17, 2014
Zhejiang Wanbang Pharmaceutical Plc., Wenling, Zhejiang, CN;
Shouming Zhao, Zhejiang, CN;
Ping Chen, Zhejiang, CN;
Shaoping Peng, Zhejiang, CN;
Yinqiang Zhuang, Zhejiang, CN;
Rongzhen Shi, Zhejiang, CN;
Jinsheng Xie, Zhejiang, CN;
Weihua Xie, Zhejiang, CN;
Abstract
The present invention relates to a method for preparing (−)-huperzine A. The method involves: allowing a mixture of (±)-huperzine A obtained from chemical synthesis and a chiral acid to form (±)-huperzine A chiral acid salt under suitable conditions; recrystallizing the chiral acid salt from an organic solvent and basifying with an alkali to obtain optically pure (−)-huperzine A. The method is convenient to operate and suitable for industrial production. The chemical purity and optical purity of (−)-huperzine A obtained by the method are each greater than 99.5%, satisfying the requirement for raw pharmaceutical purity in the pharmaceutical industry.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile