Patents by Inventor Ryutaro Yamagami

Ryutaro Yamagami 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 of producing steroid derivatives
    Patent number: 6717002
    Abstract: A method of producing 3-alkoxy-1,3,5(10)-triene-6-one-steroid derivatives having, in the steroid skeleton thereof, a partial structure of A- and B-rings represented by formula (2): (wherein R represents an alkyl group, a cycloalkyl group, an alkenyl group, or an aralkyl group), including reacting a 19-norsteroid derivative having, in the steroid skeleton thereof, a partial structure of A- and B-rings represented by formula (1): with an alcohol represented by ROH (wherein R has the same meaning as defined above) and iodine in the absence of a rare earth compound catalyst. According to the method of the present invention, 3-alkoxy-1,3,5(10)-triene-6-one-steroids can be selectively produced from 19-norsteroides through a single reaction step without employment of a special catalyst.
    Type: Grant
    Filed: October 18, 2001
    Date of Patent: April 6, 2004
    Assignee: Taiho Pharmaceutical Co., Ltd.
    Inventors: Shingo Yano, Ryutaro Yamagami, Kenji Nozaki, Tetsuji Asao
  • Method of producing steroid derivatives
    Publication number: 20020143199
    Abstract: A method of producing 3-alkoxy-1,3,5(10)-triene-6-one-steroid derivatives having, in the steroid skeleton thereof, a partial structure of A- and B-rings represented by formula (2): 1
    Type: Application
    Filed: October 18, 2001
    Publication date: October 3, 2002
    Inventors: Shingo Yano, Ryutaro Yamagami, Kenji Nozaki, Tetsuji Asao