Patents by Inventor Hiroko Koyama

Hiroko Koyama 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).

  • Patent number: 9012632
    Abstract: Provided is a method whereby a heteroaromatic ring aryl can be very rapidly methylated at a high yield. In an N-alkyl-2-pyrrolidinone, a heteroaromatic ring aryltrialkylstannan is cross-coupled with methyl iodide in the presence of a palladium complex, a phosphine ligand, a cuprous halide, a carbonic acid salt and/or an alkali metal fluoride to thereby rapidly methylate the heteroaromatic ring aryl. (Formula shows a case wherein the heteroaromatic ring aryl is a pyridyl group.
    Type: Grant
    Filed: December 25, 2009
    Date of Patent: April 21, 2015
    Assignee: Riken
    Inventors: Masaaki Suzuki, Hisashi Doi, Hiroko Koyama
  • Patent number: 8765941
    Abstract: Viruses, and particularly RNA viruses, have high mutation rates. Hence, antiviral agents that have been developed to date targeting protease or reverse transcriptase of viruses have quickly lost their effectiveness and resistant viruses have emerged. Also, in recent years, viral diseases caused by various new viruses such as SARS, avian influenza, and the hepatitis C have become social menaces. Therefore, the development of a novel antiviral agent that can cope with a virus resistant to an existing drug or a new virus and has a wide range of applications has been demanded. The present invention provides a novel anti-RNA viral agent and a method for use thereof. The present invention further provides an anti-RNA viral agent that is also effective against a new virus or a drug-resistant virus, and a method for use thereof.
    Type: Grant
    Filed: February 4, 2009
    Date of Patent: July 1, 2014
    Assignee: Kino Pharma, Inc.
    Inventors: Hiroshi Onogi, Masatoshi Hagiwara, Masaaki Suzuki, Hiroko Koyama, Takamitsu Hosoya, Toshiyuki Hiramatsu
  • Publication number: 20110263849
    Abstract: Provided is a method whereby a heteroaromatic ring aryl can be very rapidly methylated at a high yield. In an N-alkyl-2-pyrrolidinone, a heteroaromatic ring aryltrialkylstannan is cross-coupled with methyl iodide in the presence of a palladium complex, a phosphine ligand, a cuprous halide, a carbonic acid salt and/or an alkali metal fluoride to thereby rapidly methylate the heteroaromatic ring aryl. (Formula shows a case wherein the heteroaromatic ring aryl is a pyridyl group.
    Type: Application
    Filed: December 25, 2009
    Publication date: October 27, 2011
    Applicants: GIFU UNIVERSITY, RIKEN
    Inventors: Masaaki Suzuki, Hisashi Doi, Hiroko Koyama
  • Publication number: 20110059950
    Abstract: Viruses, and particularly RNA viruses, have high mutation rates. Hence, antiviral agents that have been developed to date targeting protease or reverse transcriptase of viruses have quickly lost their effectiveness and resistant viruses have emerged. Also, in recent years, viral diseases caused by various new viruses such as SARS, avian influenza, and the hepatitis C have become social menaces. Therefore, the development of a novel antiviral agent that can cope with a virus resistant to an existing drug or a new virus and has a wide range of applications has been demanded. The present invention provides a novel anti-RNA viral agent and a method for use thereof. The present invention further provides an anti-RNA viral agent that is also effective against a new virus or a drug-resistant virus, and a method for use thereof.
    Type: Application
    Filed: February 4, 2009
    Publication date: March 10, 2011
    Applicant: KinoPharma, Inc.
    Inventors: Hiroshi Onogi, Masatoshi Hagiwara, Masaaki Suzuki, Hiroko Koyama, Takamitsu Hosoya, Toshiyuki Hiramatsu