Patents by Inventor Takanobu Ikeya

Takanobu Ikeya 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 preparing halogenated cyclopropane derivatives
    Patent number: 6596898
    Abstract: A process for preparing compounds represented by the following general formula (I) wherein X represents chlorine atom, bromine atom, or iodine atom, and R includes alkoxy group and amino group which comprises the step of allowing a compound represented by the formula: CH2═CXF react with a compound represented by the formula: N2CHCOR in the presence of a catalyst containing a metal atom such as a transition metal of group 8 together with chiral carboxylic-type or amide-type ligands to preferentially obtain a stereoisomer of the compound of the general formula (I) wherein the stereochemical configuration at the 1-position is S-configuration
    Type: Grant
    Filed: February 27, 1998
    Date of Patent: July 22, 2003
    Assignees: Daiichi Pharmaceutical Co., Ltd., Sumitomo Chemical Co., Ltd.
    Inventors: Tsutomu Ebata, Toshifumi Akiba, Takanobu Ikeya, Ryuhei Wakita, Mikio Sasaki
  • PROCESS FOR PREPARING HALOGENATED CYCLOPROPANE DERIVATIVES
    Publication number: 20010051750
    Abstract: A process for preparing compounds represented by the following general formula (I) wherein X represents chlorine atom or other and R represents alkoxy group, amino group or other, which comprises the step of allowing a compound represented by the formula: CH2═CXF react with a compound represented by the formula: N2CHCOR in the presence of a catalyst containing a metal atom such as a transition metal of group 8 together with chiral carboxylic-type or amide-type ligands to preferentially obtain a stereoisomer of the compound of the general formula (I) wherein the stereochemical configuration at the 1-position is S-configuration 1
    Type: Application
    Filed: February 27, 1998
    Publication date: December 13, 2001
    Applicant: DAIICHI PHARMACEUTICAL CO., LTD.
    Inventors: TSUTOMU EBATA, TOSHIFUMI AKIBA, TAKANOBU IKEYA, RYUHEI WAKITA, MIKIO SASAKI
  • Selective dehalogenation process
    Patent number: 5780669
    Abstract: A compound represented by the following formula (1) or (3): ##STR1## is subjected to a catalytic hydrogenolysis reaction in the presence of a base and thus a compound represented by the following formula (2): ##STR2## wherein R represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms and X represents a chlorine atom or a bromine atom;is easily produced. This compound is usable as an intermediate for the preparation of drugs.
    Type: Grant
    Filed: February 1, 1996
    Date of Patent: July 14, 1998
    Assignee: Daiichi Pharmaceutical Co., Ltd.
    Inventors: Toshifumi Akiba, Takanobu Ikeya, Hirofumi Kawanishi, Yusuke Yukimoto, Shinji Kamihara, Tsutomu Ebata