Patents by Inventor Keiichi Yonetsu

Keiichi Yonetsu 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 the production of 3,5,6-trihydroxyhexanoic acid derivative
    Patent number: 4983759
    Abstract: A compound of a 3,5,6-trihydroxyhexanoic acid derivative of the formula: ##STR1## wherein P.sup.1 and P.sup.2 are independently hydrogen atoms or hydroxy-protecting groups, or together form a ring, and R is an alkyl group is effectively prepared by a process comprising steps of:reacting a butyronitrile derivative of the formula: ##STR2## wherein P.sup.1 and P.sup.2 are the same as defined above with an .alpha.-haloacetate of the formula:X--CH.sub.2 --COOR (III)wherein X is a halogen atom, and R is the same as defined above in the presence of a metallic catalyst selected from the group consisting zinc and zinc-copper to form a keto acid derivative of the formula: ##STR3## wherein P.sup.1, P.sup.2 and R are the same as defined above, and then reducing the obtained keto-acid derivative of the formula (IV).
    Type: Grant
    Filed: December 20, 1989
    Date of Patent: January 8, 1991
    Assignee: Kanegafuchi Chemical Industry Co., Ltd.
    Inventors: Kenji Inoue, Satomi Takahashi, Keiichi Yonetsu, Noboru Ueyama