Patents by Inventor Etsuko Itoh

Etsuko Itoh 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 preparation of 3-amino-2-hydroxy-4-phenylbutyronitrile derivatives
    Patent number: 5834618
    Abstract: 3-Amino-2-hydroxy-4-phenylbutyronitrile derivatives represented by the formula (3) may be prepared by reacting an aminoaldehyde derivative represented by the formula (1) with a cyanohydrin derivative represented by the formula (2) in the presence of a metallic compound, base, or acid; ##STR1## wherein R.sup.1 and R.sup.2 each independently represents a hydrogen atom or a protective group for an amino group, R.sup.3 and R.sup.4 each represents an alkyl or cycloalkyl group or R.sup.3 and R.sup.4 together form a tetramethylene or pentamethylene group.
    Type: Grant
    Filed: December 19, 1997
    Date of Patent: November 10, 1998
    Assignees: Kuraray Co., Ltd., Sagami Chemical Research Center
    Inventors: Shiro Terashima, Norio Shibata, Etsuko Itoh