Patents by Inventor Qunhui Zhang

Qunhui Zhang has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Intermediates of sitagliptin and preparation process thereof
    Patent number: 9187419
    Abstract: Disclosed are intermediates of Sitagliptin, a preparation process thereof, and a process for synthesizing Sitagliptin using these intermediates. Sitagliptin is synthesized by using chiral amino compounds as a raw material, without having to build a chiral center with a chiral asymmetric catalytic hydrogenation, and high-pressure hydrogenation is avoided.
    Type: Grant
    Filed: December 1, 2011
    Date of Patent: November 17, 2015
    Assignee: ZHEJIANG HISOAR PHARMACEUTICAL CO., LTD.
    Inventors: Xianhua Pan, Weijin Li, Qunhui Zhang, Libo Ruan, Wansheng Yu, Fei Deng, Tianhua Ma, Mingwang Huang, Minhuan He
  • INTERMEDIATES OF SITAGLIPTIN AND PREPARATION PROCESS THEREOF
    Publication number: 20130281695
    Abstract: Disclosed are intermediates of Sitagliptin, a preparation process thereof, and a process for synthesizing Sitagliptin using these intermediates. Sitagliptin is synthesized by using chiral amino compounds as a raw material, without having to build a chiral center with a chiral asymmetric catalytic hydrogenation, and high-pressure hydrogenation is avoided.
    Type: Application
    Filed: December 1, 2011
    Publication date: October 24, 2013
    Applicant: ZHEJIANG HISOAR PHARMACEUTICAL CO., LTD.
    Inventors: Xianhua Pan, Weijin Li, Qunhui Zhang, Libo Ruan, Wansheng Yu, Fei Deng, Tianhua Ma, Mingwang Huang, Minhuan He