Patents by Inventor Yasuhisa Kuwahara

Yasuhisa Kuwahara 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 Manufacturing Neuraminic Acid Derivatives
    Publication number: 20170114035
    Abstract: The present invention provides methods for manufacturing neuraminic acid derivatives. [Means for solution] Methods for manufacturing compounds represented by the formula (I): [wherein R1 represents a C1-C19 alkyl group], or a pharmacologically acceptable salt thereof, using N-acetylneuraminic acid dihydrate as a starting raw material are provided.
    Type: Application
    Filed: January 9, 2017
    Publication date: April 27, 2017
    Inventors: Tomohito SAKURAI, Takumi NAKAJIMA, Masakazu WAKAYAMA, Fumihiko TORIYAMA, Yasuhisa KUWAHARA
  • METHOD FOR PRODUCING TRICYCLIC HETEROCYCLIC COMPOUND
    Publication number: 20160137644
    Abstract: It is an object of the present invention to provide a method for producing a high-purity tricyclic heterocyclic compound represented by formula (I), which is useful as a production intermediate for a pharmaceutical agent, wherein the method is an efficient production method with short steps and with a high yield, which does not use, as raw materials, expensive bromopyruvate and highly harmful copper chromite, and does not need silica gel column chromatography that generates, as by-products, large quantities of waste. The present invention relates to production of Compound (I) by the following method.
    Type: Application
    Filed: June 25, 2014
    Publication date: May 19, 2016
    Applicant: Daiichi Sankyo Company, Limited
    Inventors: Hisaki Kajino, Makoto Michida, Yasuo Takahashi, Yasuhisa Kuwahara
  • Method for Manufacturing Neuraminic Acid Derivatives
    Publication number: 20140356625
    Abstract: The present invention provides methods for manufacturing neuraminic acid derivatives. [Means for solution] Methods for manufacturing compounds represented by the formula (I): [wherein R1 represents a C1-C19 alkyl group], or a pharmacologically acceptable salt thereof, using N-acetylneuraminic acid dihydrate as a starting raw material are provided.
    Type: Application
    Filed: December 13, 2012
    Publication date: December 4, 2014
    Inventors: Tomohito Sakurai, Takumi Nakajima, Masakazu Wakayama, Fumihiko Toriyama, Yasuhisa Kuwahara