Patents by Inventor Wei-Der Lee

Wei-Der Lee 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).

  • Synthesis of ?-nucleosides
    Patent number: 8193339
    Abstract: This invention relates to a process of stereoselectively synthesizing a ?-nucleoside compound of formula (I): wherein R1, R2, and B are as defined in the specification; each of R3 and R4, independently, is H or fluoro. The process includes reacting, in the presence of a transition metal salt, a tetrahydrofuran compound of formula (II): wherein R1, R2, and L are as defined in the specification, with a nucleobase derivative; and each of R3 and R4, independently, is H or fluoro.
    Type: Grant
    Filed: November 6, 2008
    Date of Patent: June 5, 2012
    Assignee: Pharmaessentia Corp.
    Inventors: Chi-Yuan Chu, Wei-Der Lee, Wensen Li, Chan Kou Hwang
  • NOVEL SYNTHESIS OF BETA-NUCLEOSIDES
    Publication number: 20090124797
    Abstract: This invention relates to a process of stereoselectively synthesizing ?-nucleoside, e.g., 2?-deoxy-2,2?-difluorocytidine.
    Type: Application
    Filed: November 6, 2008
    Publication date: May 14, 2009
    Applicant: PharmaEssentia Corporation
    Inventors: Chi-Yuan Chu, Wei-Der Lee, Wensen Li, Chan Kou Hwang
  • Chiral cheating agent and chiral catalyst
    Patent number: 6894172
    Abstract: Chiral chelating agents and chiral catalysts, which are formed from the chiral chelating agents and metal, are described. One chiral chelating agent has a general formula (1) as illustrated below: wherein R represents H, methyl, ethyl, a primary, secondary or tertiary straight, branched or cyclic alkyl group having 3-7 carbon atoms, a heterocyclic or aromatic group, an aromatic group substituted at the 2-, 3- or 4-position, an aromatic-like group, or a naphthyl or naphthyl-derived group, and n is an integer between 0 and 4.
    Type: Grant
    Filed: July 1, 2003
    Date of Patent: May 17, 2005
    Assignee: National Taiwan Normal University
    Inventors: Kwunmin Chen, Kung-Shou Yang, Wei-Der Lee, Jia-Fu Pan
  • Chiral cheating agent and chiral catlyst
    Publication number: 20040176243
    Abstract: Chiral chelating agents and chiral catalysts, which are formed from the chiral chelating agents and metal, are described.
    Type: Application
    Filed: July 1, 2003
    Publication date: September 9, 2004
    Inventors: Kwunmin Chen, Kung-Shou Yang, Wei-Der Lee, Jia-Fu Pan