Patents by Inventor Wakako Yokota

Wakako Yokota 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 1-substituted-3-fluoroalkylpyrazole-4-carboxylate
    Patent number: 7863460
    Abstract: In a process for producing 1-substituted-3-fluoroalkyl-pyrazole-4-carboxylate (3) by a reaction of 2-alkoxymethylenefluoroacylacetate (1) and hydrazine (2), the reaction is conducted in the presence of a base and water, to produce 1-substituted-3-fluoroalkylpyrazole-4-carboxylate (3) with high selectivity and yield. This novel process enables to produce 1-substituted-3-fluoroalkylpyrazole-4-carboxylate (3), which is useful as an intermediate for pharmaceuticals and agrochemicals, with high selectivity and yield by simple and safe operations.
    Type: Grant
    Filed: February 23, 2006
    Date of Patent: January 4, 2011
    Assignees: Sagami Chemical Research Center, Japan Finechem Company, Inc.
    Inventors: Hidenori Aihara, Wakako Yokota, Tetsu Yamakawa, Kenji Hirai
  • Pyrazole-1-carboxylate derivatives, process for the production thereof and process for the production of pyrazole derivatives
    Patent number: 7767827
    Abstract: Disclosed are pyrazole-1-carboxylate derivatives of the general formula (1), (wherein symbols are as defined in the specification), a process for the production thereof and processes for producing herbicidally active 3-aryloxypyrazole-1-carboxamide derivatives from the above compound and an intermediate therefor. According to this invention, there can be industrially advantageously produced 3-aryloxypyrazole-1-carboxamide derivatives that does not cause chemical damage on crops but exhibits excellent herbicidal activity against weeds that impair the growth of such crops.
    Type: Grant
    Filed: May 22, 2006
    Date of Patent: August 3, 2010
    Assignees: Kaken Pharmaceutical Co., Ltd., Sagami Chemical Research Center
    Inventors: Atsushi Uchida, Wakako Yokota, Kenji Hirai, Tomoyuki Yano
  • PYRAZOLE-1-CARBOXYLATE DERIVATIVES, PROCESS FOR THE PRODUCTION THEREOF AND PROCESS FOR THE PRODUCTION OF PYRAZOLE DERIVATIVES
    Publication number: 20090018345
    Abstract: Disclosed are pyrazole-1-carboxylate derivatives of the general formula (1), (wherein symbols are as defined in the specification), a process for the production thereof and processes for producing herbicidally active 3-aryloxypyrazole-1-carboxamide derivatives from the above compound and an intermediate therefor. According to this invention, there can be industrially advantageously produced 3-aryloxypyrazole-1-carboxamide derivatives that does not cause chemical damage on crops but exhibits excellent herbicidal activity against weeds that impair the growth of such crops.
    Type: Application
    Filed: May 22, 2006
    Publication date: January 15, 2009
    Applicants: KAKEN PHARMACEUTICAL CO., LTD., SAGAMI CHEMICAL RESEARCH CENTER
    Inventors: Atsushi Uchida, Wakako Yokota, Kenji Hirai, Tomoyuki Yano
  • Process for Producing 1-Substituted-3-Fluoroalkylpyrazole-4-Carboxylate
    Publication number: 20080154045
    Abstract: In a process for producing 1-substituted-3-fluoroalkyl-pyrazole-4-carboxylate (3) by a reaction of 2-alkoxymethylenefluoroacylacetate (1) and hydrazine (2), the reaction is conducted in the presence of a base and water, to produce 1-substituted-3-fluoroalkylpyrazole-4-carboxylate (3) with high selectivity and yield. This novel process enables to produce 1-substituted-3-fluoroalkylpyrazole-4-carboxylate (3), which is useful as an intermediate for pharmaceuticals and agrochemicals, with high selectivity and yield by simple and safe operations.
    Type: Application
    Filed: February 23, 2006
    Publication date: June 26, 2008
    Applicants: Sagami Chemical researckh Center, Japan Finechem Company, INC.
    Inventors: Hidenori Aihara, Wakako Yokota, Tetsu Yamakawa, Kenji Hirai