Patents by Inventor Toshiyuki Watai

Toshiyuki Watai 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).

  • Process for producing (dioxolenon-4-yl)methyl ester derivative
    Patent number: 7041820
    Abstract: There is provided a method by which various compounds (1) having a carboxyl group in the molecule have the carboxyl group converted to a (dioxolenon-4-yl)methyl ester at low cost, in a simple way and at high yield. The process for producing compounds of formula (3) according to the reaction scheme shown below comprises reacting carboxylic acids of formula (1) with 4-chloromethyldioxolenone compounds of formula (2) in a solvent in the presence of both a phase transfer catalyst and a metal iodide: [where Q represents an organic group, M represents a hydrogen atom, an alkali metal, an alkaline earth metal or a transition metal, R1 and R2 represent a hydrogen atom, an optionally substituted (C1-6 alkyl group or phenyl group)].
    Type: Grant
    Filed: March 29, 2002
    Date of Patent: May 9, 2006
    Assignees: Nippon Soda Co., Ltd., Daiichi Asubio Pharma Co., Ltd.
    Inventors: Toshiyuki Watai, Mitsuru Takase, Takahiro Sagae, Shigeo Mori, Noriaki Kawahara
  • Process for producing (dioxolenon-4-yl)methyl ester derivative
    Publication number: 20040133016
    Abstract: There is provided a method by which various compounds (1) having a carboxyl group in the molecule have the carboxyl group converted to a (dioxolenon-4-yl)methyl ester at low cost, in a simple way and at high yield.
    Type: Application
    Filed: February 18, 2004
    Publication date: July 8, 2004
    Inventors: Toshiyuki Watai, Mitsuru Takase, Takahiro Sagae, Shigeo Mori, Noriaki Kawahara