Patents by Inventor Jyunji Katsuyama

Jyunji Katsuyama 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 production of 4-fluoroisoquinoline-5-sulfonyl halide or salt thereof
    Patent number: 7872136
    Abstract: To provide an effective and simple process for producing 4-fluoroisoquinoline-5-sulfonylhalide or a salt thereof, and a simple method for separating for purification of the product from a by-produced position isomer thereof. The process for producing 4-fluoroisoquinoline-5-sulfonyl halide or a salt thereof, characterized in that the process includes reacting 4-fluoroisoquinoline or a salt thereof with sulfuric anhydride in the presence or absence of sulfuric acid, to thereby form 4-fluoroisoquinoline-5-sulfonic acid or a salt thereof, and, subsequently, reacting the formed sulfonic acid compound with a halogenating reagent.
    Type: Grant
    Filed: February 23, 2006
    Date of Patent: January 18, 2011
    Assignee: Kowa Co., Ltd.
    Inventors: Hitoshi Sakai, Masayuki Masumoto, Jyunji Katsuyama, Kazuhiro Onogi
  • PROCESS FOR PRODUCTION OF 4-FLUOROISOQUINOLINE-5-SULFONYL HALIDE OR SALT THEREOF
    Publication number: 20090209765
    Abstract: To provide an effective and simple process for producing 4-fluoroisoquinoline-5-sulfonyl halide or a salt thereof, and a simple method for separating for purification of the product from a by-produced position isomer thereof. The process for producing 4-fluoroisoquinoline-5-sulfonyl halide or a salt thereof, characterized in that the process includes reacting 4-fluoroisoquinoline or a salt thereof with sulfuric anhydride in the presence or absence of sulfuric acid, to thereby form 4-fluoroisoquinoline-5-sulfonic acid or a salt thereof, and, subsequently, reacting the formed sulfonic acid compound with a halogenating reagent.
    Type: Application
    Filed: February 23, 2006
    Publication date: August 20, 2009
    Applicant: Kowa Co., Ltd.
    Inventors: Hitoshi Sakai, Masayuki Masumoto, Jyunji Katsuyama, Kazuhiro Onogi