Patents by Inventor Takafumi KITAWAKI

Takafumi KITAWAKI 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).

  • Method for producing 3,6-disubstituted-imidazo[1,2-b]pyridazine derivative
    Patent number: 11667642
    Abstract: Provided is a novel and industrially useful method for producing a 3,6-disubstituted imidazo[1,2-b]pyridazine derivative. The present invention provides a method for producing a 3,6-disubstituted imidazo[1,2-b]pyridazine derivative, which uses 6-fluoroimidazo[1,2-b]pyridazine as a starting material, while using an aromatic substitution reaction that utilizes C—H activation by means of palladium.
    Type: Grant
    Filed: February 1, 2021
    Date of Patent: June 6, 2023
    Assignee: Daiichi Sankyo Company, Limited
    Inventors: Ryoji Koike, Yoshifumi Hachisu, Takafumi Kitawaki, Shohei Shiraishi
  • Method for Producing 3,6-Disubstituted-Imidazo[1,2-B]Pyridazine Derivative
    Publication number: 20210171532
    Abstract: Provided is a novel and industrially useful method for producing a 3,6-disubstituted imidazo[1,2-b]pyridazine derivative. The present invention provides a method for producing a 3,6-disubstituted imidazo[1,2-b]pyridazine derivative, which uses 6-fluoroimidazo[1,2-b]pyridazine as a starting material, while using an aromatic substitution reaction that utilizes C—H activation by means of palladium.
    Type: Application
    Filed: February 1, 2021
    Publication date: June 10, 2021
    Inventors: Ryoji Koike, Yoshifumi Hachisu, Takafumi Kitawaki, Shohei Shiraishi
  • Method for producing 3, 6-disubstituted imidazo[1, 2-b]pyridazine derivative
    Patent number: 11028091
    Abstract: Provided is a novel and industrially useful method for producing a 3, 6-disubstituted imidazo[1, 2-b]pyridazine derivative. The present invention provides a method for producing a 3, 6-disubstituted imidazo[1, 2-b]pyridazine derivative, which uses 6-fluoroimidazo[1, 2-b]pyridazine as a starting material, while using an aromatic substitution reaction that utilizes C—H activation by means of palladium.
    Type: Grant
    Filed: March 13, 2018
    Date of Patent: June 8, 2021
    Assignee: Daiichi Sankyo Company, Limited
    Inventors: Ryoji Koike, Yoshifumi Hachisu, Takafumi Kitawaki, Shohei Shiraishi
  • Method for Producing 3, 6-Disubstituted Imidazo[1, 2-b]Pyridazine Derivative
    Publication number: 20200062765
    Abstract: Provided is a novel and industrially useful method for producing a 3, 6-disubstituted imidazo[1, 2-b]pyridazine derivative. The present invention provides a method for producing a 3, 6-disubstituted imidazo[1, 2-b]pyridazine derivative, which uses 6-fluoroimidazo[1, 2-b]pyridazine as a starting material, while using an aromatic substitution reaction that utilizes C—H activation by means of palladium.
    Type: Application
    Filed: March 13, 2018
    Publication date: February 27, 2020
    Applicant: DAIICHI SANKYO COMPANY, LIMITED
    Inventors: Ryoji KOIKE, Yoshifumi HACHISU, Takafumi KITAWAKI, Shohei SHIRAISHI
  • Preparation method for optically active bicyclic gamma-amino acid compound
    Patent number: 9469623
    Abstract: An object of the present invention is to provide an optically active bicyclic ?-amino acid derivative in a high purity.
    Type: Grant
    Filed: February 6, 2015
    Date of Patent: October 18, 2016
    Assignee: Daiichi Sankyo Company, Limited
    Inventors: Yoshitaka Nakamura, Kazutoshi Ukai, Takafumi Kitawaki, Takumi Nakajima, Yutaka Kitagawa, Yukito Furuya, Makoto Imai, Eiji Numagami, Masakazu Wakayama, Ayako Saito
  • Preparation Method for Optically Active Bicyclic Gamma-Amino Acid Compound
    Publication number: 20150218123
    Abstract: An object of the present invention is to provide an optically active bicyclic ?-amino acid derivative in a high purity.
    Type: Application
    Filed: February 6, 2015
    Publication date: August 6, 2015
    Applicant: Daiichi Sankyo Company, Limited
    Inventors: Yoshitaka NAKAMURA, Kazutoshi UKAI, Takafumi KITAWAKI, Takumi NAKAJIMA, Yutaka KITAGAWA, Yukito FURUYA, Makoto IMAI, Eiji NUMAGAMI, Masakazu WAKAYAMA, Ayako SAITO
  • Optical resolution methods for bicyclic compounds using asymmetric catalysts
    Patent number: 9035103
    Abstract: An optically active bicyclic compound is efficiently produced by optical resolution using an optically active amine.
    Type: Grant
    Filed: June 10, 2014
    Date of Patent: May 19, 2015
    Assignee: Daiichi Sankyo Company, Limited
    Inventors: Yoshitaka Nakamura, Takafumi Kitawaki, Takeshi Kaneda
  • Optical Resolution Method for Bicyclic Compound Using Asymmetric Catalyst
    Publication number: 20140296569
    Abstract: An optically active bicyclic compound is efficiently produced by optical resolution using an optically active amine.
    Type: Application
    Filed: June 10, 2014
    Publication date: October 2, 2014
    Applicant: Daiichi Sankyo Company, Limited
    Inventors: Yoshitaka NAKAMURA, Takafumi KITAWAKI, Takeshi KANEDA