Patents by Inventor Kazutoyo Dokei

Kazutoyo Dokei 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).

  • Production process of ethynylthymidine compounds from 5-methyluridine as a starting material
    Patent number: 8445669
    Abstract: The present invention provides a process for producing 2?,3?-didehydro-3?-deoxy-4?-ethynylthymidine, which is useful as a medicine, in an efficient and industrially advantageous manner, and more specifically, provides a process for producing 2?,3?-didehydro-3?-deoxy-4?-ethynylthymidine as shown below. (wherein R1 and R2 independently represent a protective group for a hydroxy group, or R1 and R2 together form a protective group for two hydroxy groups, R3 and R4 independently represent a protective group for a hydroxy group, R5 represents a protective group for a hydroxy group, R6 represents a protective group for a hydroxy group, X represents a leaving group, and Y represents a halogen atom.
    Type: Grant
    Filed: April 10, 2009
    Date of Patent: May 21, 2013
    Assignee: Hamari Chemicals, Ltd.
    Inventors: Tatsunori Sato, Tetsuya Kawashima, Toshio Miwa, Kazutoyo Dokei, Chikoto Fujimoto
  • PRODUCTION PROCESS OF ETHYNYLTHYMIDINE COMPOUNDS FROM 5-METHYLURIDINE AS A STARTING MATERIAL
    Publication number: 20110054164
    Abstract: The present invention provides a process for producing 2?,3?-didehydro-3?-deoxy-4?-ethynylthymidine, which is useful as a medicine, in an efficient and industrially advantageous manner, and more specifically, provides a process for producing 2?,3?-didehydro-3?-deoxy-4?-ethynylthymidine as shown below. (wherein R1 and R2 independently represent a protective group for a hydroxy group, or R1 and R2 together form a protective group for two hydroxy groups, R3 and R4 independently represent a protective group for a hydroxy group, R5 represents a protective group for a hydroxy group, R6 represents a protective group for a hydroxy group, X represents a leaving group, and Y represents a halogen atom.
    Type: Application
    Filed: April 10, 2009
    Publication date: March 3, 2011
    Inventors: Tatsunori Sato, Tetsuya Kawashima, Toshio Miwa, Kazutoyo Dokei, Chikoto Fujimoto