Patents by Inventor Ken-ichi Koyakumaru

Ken-ichi Koyakumaru 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).

  • 4-chloro-3,5-dimethyl-2-sulfonyl pyridines
    Patent number: 6350876
    Abstract: 2-Sulfonylpyridine derivatives can be industrially produced efficiently by reacting a sulfonyl cyanide derivative with an &agr;,&bgr;-unsaturated carbonyl compound and a 2-{[(2-pyridyl)methyl]thio}-1H-benzimidazole skeleton can be formed in one step in a good yield by reacting this type of the 2-sulfonylpyridine derivative with a 2-methylthio-1H-benzimidazole derivative in the presence of an organolithium compound.
    Type: Grant
    Filed: December 7, 2000
    Date of Patent: February 26, 2002
    Assignee: Kuraray Co., Ltd.
    Inventors: Ken-ichi Koyakumaru, Takashi Sugioka, Tomoya Kuwayama, Goro Asanuma
  • Method for producing 2-sulfonylpyridine derivatives and method for producing 2- { [ (2-pyridyl) methyl] thio} -1H-benzimidazole derivatives
    Publication number: 20010051726
    Abstract: 2-Sulfonylpyridine derivatives can be industrially produced efficiently by reacting a sulfonyl cyanide derivative with an &agr;,&bgr;-unsaturated carbonyl compound and a 2-{[(2-pyridyl)methyl]thio}-1H-benzimidazole skeleton can be formed in one step in a good yield by reacting this type of the 2-sulfonylpyridine derivative with a 2-methylthio-1H-benzimidazole derivative in the presence of an organolithium compound.
    Type: Application
    Filed: December 7, 2000
    Publication date: December 13, 2001
    Applicant: KURARAY CO., LTD.
    Inventors: Ken-Ichi Koyakumaru, Takashi Sugioka, Tomoya Kuwayama, Goro Asanuma
  • Method for producing 2-sulfonylpyridine derivatives and method for producing 2-{[(2-pyridyl)methyl]thio}-1H-benzimidazole derivatives
    Patent number: 6197962
    Abstract: 2-Sulfonylpyridine derivatives can be industrially produced efficiently by reacting a sulfonyl cyanide derivative with an &agr;, &bgr;-unsaturated carbonyl compound and a 2-{[(2-pyridyl)methyl]thio}-1H-benzimidazole skeleton can be formed in one step in a good yield by reacting this type of the 2-sulfonylpyridine derivative with a 2-methylthio-1H-benzimidazole derivative in the presence of an organolithium compound.
    Type: Grant
    Filed: January 25, 1999
    Date of Patent: March 6, 2001
    Assignee: Kuraray Co., Ltd.
    Inventors: Ken-ichi Koyakumaru, Takashi Sugioka, Tomoya Kuwayama, Goro Asanuma