Patents by Inventor Mitsugi Shibano

Mitsugi Shibano 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).

  • Processes for the production of 13-ether derivatives of milbemycins and novel intermediates therefor
    Patent number: 5625078
    Abstract: An intermediate useful in the synthesis of milbemycin derivatives having an ether bond at the 13-position and which is represented by the general formula (IIId): ##STR1## wherein R represents a methyl group, an ethyl group, an isopropyl group or a sec-butyl group, and R.sup.5 and R.sup.6' each individually represents a hydrogen atom or a protecting group,and related precursors as well as to a process for producing these intermediates.
    Type: Grant
    Filed: May 11, 1995
    Date of Patent: April 29, 1997
    Assignee: Sankyo Company, Limited
    Inventors: Mitsugi Shibano, Mutsuo Suzuki, Shunshi Kojima
  • Processes for the production of 13-ether derivatives of milbemycins, and intermediates therefor
    Patent number: 5461168
    Abstract: An intermediate useful in the synthesis of milbemycin derivatives having an ether bond at the 13-position and which is represented by the general formula (IIId): ##STR1## wherein R represents a methyl group, an ethyl group, an isopropyl group or a sec-butyl group, and R.sup.5 and R.sup.6' each individually represents a hydrogen atom or a protecting group,and related precursors as well as to a process for producing these intermediates.
    Type: Grant
    Filed: August 31, 1993
    Date of Patent: October 24, 1995
    Assignee: Sankyo Company, Limited
    Inventors: Mitsugi Shibano, Mutsauo Suzuki, Shunshi Kojima