Patents by Inventor Hitoshi Iikura

Hitoshi Iikura 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).

  • Publication number: 20240166689
    Abstract: An object of the present invention is to provide methods of discovering drugs effective for tough targets, which have conventionally been discovered only with difficulty. The present invention relates to novel methods for cyclizing peptide compounds, and novel peptide compounds and libraries comprising the same, to achieve the above object.
    Type: Application
    Filed: September 1, 2023
    Publication date: May 23, 2024
    Inventors: Shiori KARIYUKI, Takeo IIDA, Miki KOJIMA, Ryuichi TAKEYAMA, Mikimasa TANADA, Tetsuo KOJIMA, Hitoshi IIKURA, Atsushi MATSUO, Takuya SHIRAISHI, Takashi EMURA, Kazuhiko NAKANO, Koji TAKANO, Kousuke ASOU, Takuya TORIZAWA, Ryusuke TAKANO, Nozomi HISADA, Naoaki MURAO, Atsushi OHTA, Kaori KIMURA, Yusuke YAMAGISHI, Tatsuya KATO
  • Patent number: 11891457
    Abstract: An object of the present invention is to provide methods of discovering drugs effective for tough targets, which have conventionally been discovered only with difficulty. The present invention relates to novel methods for cyclizing peptide compounds, and novel peptide compounds and libraries comprising the same, to achieve the above object.
    Type: Grant
    Filed: September 3, 2020
    Date of Patent: February 6, 2024
    Assignee: Chugai Seiyaku Kabushiki Kaisha
    Inventors: Shiori Kariyuki, Takeo Iida, Miki Kojima, Ryuichi Takeyama, Mikimasa Tanada, Tetsuo Kojima, Hitoshi Iikura, Atsushi Matsuo, Takuya Shiraishi, Takashi Emura, Kazuhiko Nakano, Koji Takano, Kousuke Asou, Takuya Torizawa, Ryusuke Takano, Nozomi Hisada, Naoaki Murao, Atsushi Ohta, Kaori Kimura, Yusuke Yamagishi, Tatsuya Kato
  • Publication number: 20200131669
    Abstract: The present inventors have found that when screening for cyclic peptide compounds that can specifically bind to a target molecule, the use of a library including cyclic peptide compounds having a long side chain in the cyclic portion can improve the hit rate for cyclic peptide compounds that can specifically bind to the target molecule. Meanwhile, the present inventors have found that tryptophan and tyrosine residues, which have conventionally been used in oral low molecular-weight pharmaceuticals and are amino acid residues having an indole skeleton or a hydroxyphenyl group, are not suitable for peptides intended to attain high membrane permeability.
    Type: Application
    Filed: June 8, 2018
    Publication date: April 30, 2020
    Inventors: Terushige MURAOKA, Takeo IIDA, Atsushi MATSUO, Ryuichi TAKEYAMA, Mikimasa TANADA, Shota TANAKA, Ryuji HAYASHI, Machiko FUJINO, Hitoshi IIKURA
  • Publication number: 20190338050
    Abstract: When the initiation suppression method was used for translation of a peptide having at its N terminus an amino acid residue carrying a thiol group near its amino group with specific protecting groups being introduced to the thiol group and the amino group, it was found that not only the probability of initiation of amino acid translation reaction was improved, but also production of cleaved peptides was suppressed and translation efficiency and purity were improved. Furthermore, it was found that it is possible to efficiently promote the cyclization reaction of the peptide through amide bond formation. Based on these findings, the inventors discovered novel methods for preparing complexes between nucleic acids and peptides containing various unnatural amino acids and having an amide bond-mediated cyclized portion.
    Type: Application
    Filed: March 3, 2017
    Publication date: November 7, 2019
    Applicant: CHUGAI SEIYAKU KABUSHIKI8 KAISHA
    Inventors: Kazuhiko NAKANO, Atsushi OHTA, Takeo IIDA, Hitoshi IIKURA
  • Publication number: 20160311858
    Abstract: An object of the present invention is to provide methods of discovering drugs effective for tough targets, which have conventionally been discovered only with difficulty. The present invention relates to novel methods for cyclizing peptide compounds, and novel peptide compounds and libraries comprising the same, to achieve the above object.
    Type: Application
    Filed: May 27, 2016
    Publication date: October 27, 2016
    Applicant: Chugai Seiyaku Kabushiki Kaisha
    Inventors: Shiori Kariyuki, Takeo Iida, Miki Kojima, Ryuichi Takeyama, Mikimasa Tanada, Tetsuo Kojima, Hitoshi Iikura, Atsushi Matsuo, Takuya Shiraishi, Takashi Emura, Kazuhiko Nakano, Koji Takano, Kousuke Asou, Takuya Torizawa, Ryusuke Takano, Nozomi Hisada, Naoaki Murao, Atsushi Ohta, Kaori Kimura, Yusuke Yamagishi, Tatsuya Kato
  • Patent number: 9409952
    Abstract: An object of the present invention is to provide methods of discovering drugs effective for tough targets, which have conventionally been discovered only with difficulty. The present invention relates to novel methods for cyclizing peptide compounds, and novel peptide compounds and libraries comprising the same, to achieve the above object.
    Type: Grant
    Filed: December 28, 2012
    Date of Patent: August 9, 2016
    Assignee: Chugai Seiyaku Kabushiki Kaisha
    Inventors: Shiori Kariyuki, Takeo Iida, Miki Kojima, Ryuichi Takeyama, Mikimasa Tanada, Tetsuo Kojima, Hitoshi Iikura, Atsushi Matsuo, Takuya Shiraishi, Takashi Emura, Kazuhiko Nakano, Koji Takano, Kousuke Asou, Takuya Torizawa, Ryusuke Takano, Nozomi Hisada, Naoaki Murao, Atsushi Ohta, Kaori Kimura, Yusuke Yamagishi, Tatsuya Kato
  • Publication number: 20150080549
    Abstract: An object of the present invention is to provide methods of discovering drugs effective for tough targets, which have conventionally been discovered only with difficulty. The present invention relates to novel methods for cyclizing peptide compounds, and novel peptide compounds and libraries comprising the same, to achieve the above object.
    Type: Application
    Filed: December 28, 2012
    Publication date: March 19, 2015
    Inventors: Shiori Kariyuki, Takeo Iida, Miki Kojima, Ryuichi Takeyama, Mikimasa Tanada, Tetsuo Kojima, Hitoshi Iikura, Atsushi Matsuo, Takuya Shiraishi, Takashi Emura, Kazuhiko Nakano, Koji Takano, Kousuke Asou, Takuya Torizawa, Ryusuke Takano, Nozomi Hisada, Naoaki Murao, Atsushi Ohta, Kaori Kimura, Yusuke Yamagishi, Tatsuya Kato
  • Patent number: 8575391
    Abstract: An objective of the present invention is to provide compounds that exhibit strong MEK-inhibiting activity and are stable in vivo and soluble in water, which can be used as preventive or therapeutic agents for proliferative diseases. The compounds of the present invention and pharmaceutically acceptable salts thereof are represented by the following formula (1): [where R1, R2, R3, R4, and X are the same as defined in the present patent application].
    Type: Grant
    Filed: April 1, 2010
    Date of Patent: November 5, 2013
    Assignee: Chugai Seiyaku Kabushiki Kaisha
    Inventors: Yoshiaki Isshiki, Yasunori Kohchi, Eisaku Mizuguchi, Hitoshi Iikura, Yasuaki Matsubara, Shinji Tsujii, Nobuo Shimma, Masanori Miwa, Satoshi Aida, Masami Kohchi, Takeshi Murata, Kosuke Aso
  • Patent number: 8569378
    Abstract: The present invention provides a p27 protein inducing agent comprising a compound represented by general formula (11) below or pharmaceutically acceptable salt thereof as an active ingredient: wherein G1, G2, G3 and G8 are each independently selected from —N? etc., Ring G6 is selected from divalent aryl etc., A is selected from amino etc., G4 is selected from oxygen etc., G5 is selected from oxygen etc., G7 is selected from —CH2— etc., and R2 is selected from C1-6 alkyl etc.
    Type: Grant
    Filed: July 18, 2008
    Date of Patent: October 29, 2013
    Assignees: Chugai Seiyaku Kabushiki Kaisha
    Inventors: Toshiyuki Sakai, Hitoshi Iikura, Ikumi Hyoudoh, Toshihiro Aoki, Noriyuki Furuichi, Masayuki Matsushita, Fumio Watanabe, Sawako Ozawa, Masahiro Sakaitani, Pil-Su Ho, Yasushi Tomii, Kenji Takanashi, Naoki Harada
  • Patent number: 8278465
    Abstract: The present invention provides a compound represented by general formula (1) below or a pharmaceutically acceptable salt thereof: wherein: X is selected from heteroaryl etc., Y1 and Y2 are selected from —N? etc., Y3 and Y4 are selected from —CH? etc., A is selected from sulfamide etc., R1 is selected from hydrogen etc., and R2 is selected from C1-6 alkyl etc. The compound or salt has sufficiently high antitumor activity, and is useful in the treatment of cell proliferative disorders, particularly cancers. The present invention also provides a pharmaceutical composition containing the compound or salt as an active ingredient.
    Type: Grant
    Filed: December 3, 2010
    Date of Patent: October 2, 2012
    Assignees: Chugai Seiyaku Kabushiki Kaisha, Sakai Toshiyuki
    Inventors: Hitoshi Iikura, Ikumi Hyoudoh, Toshihiro Aoki, Noriyuki Furuichi, Masayuki Matsushita, Fumio Watanabe, Sawako Ozawa, Masahiro Sakaitani, Pil-Su Ho, Yasushi Tomii, Kenji Takanashi, Naoki Harada
  • Patent number: 8084645
    Abstract: A compound of the present invention, or a pharmaceutically acceptable salt thereof is indicated by formula (1) below: wherein, R1, R2, R3, R4, R5, R6, Q, R8, and R9 have the same meanings as R1, R2, R3, R4, R5, R6, Q, R8, and R9 in the specification.
    Type: Grant
    Filed: September 16, 2004
    Date of Patent: December 27, 2011
    Assignee: Chugai Seiyaku Kabushiki Kaisha
    Inventors: Yoshiaki Isshiki, Yasunori Kohchi, Kazuo Hattori, Nobuo Shimma, Masanori Miwa, Naohito Inagaki, Hitoshi Iikura, Yasuaki Matsubara
  • Patent number: 8022247
    Abstract: The invention provides a process for production of 2,3,4-trifluoro-5-(iodo or bromo)benzoic acid, the process comprising a halogenation step in which direct iodination or bromination of 2,3,4-trifluorobenzoic acid is performed with an iodinating agent or brominating agent in a reaction solvent in the presence of an oxidizing agent. According to the invention, there is provided a process for convenient production of 2,3,4-trifluoro-5-(iodo or bromo)benzoic acid in high yield and high purity in a highly regioselective manner.
    Type: Grant
    Filed: April 6, 2006
    Date of Patent: September 20, 2011
    Assignee: Chugai Seiyaku Kabushiki Kaisha
    Inventors: Hiroshi Koyano, Hitoshi Iikura, Yoshiaki Isshiki, Yasunori Kohchi
  • Publication number: 20110092700
    Abstract: The present invention provides a compound represented by general formula (1) below or a pharmaceutically acceptable salt thereof: wherein: X is selected from heteroaryl etc., Y1 and Y2 are selected from —N? etc., Y3 and Y4 are selected from —CH? etc., A is selected from sulfamide etc., R1 is selected from hydrogen etc., and R2 is selected from C1-6 alkyl etc. The compound or salt has sufficiently high antitumor activity, and is useful in the treatment of cell proliferative disorders, particularly cancers. The present invention also provides a pharmaceutical composition containing the compound or salt as an active ingredient.
    Type: Application
    Filed: December 3, 2010
    Publication date: April 21, 2011
    Inventors: Hitoshi Iikura, Ikumi Hyoudoh, Toshihiro Aoki, Noriyuki Furuichi, Masayuki Matsushita, Fumio Watanabe, Sawako Ozawa, Masahiro Sakaitani, Pil-Su Ho, Yasushi Tomii, Kenji Takanashi, Naoki Harada
  • Patent number: 7897792
    Abstract: The present invention provides a compound represented by general formula (1) below or a pharmaceutically acceptable salt thereof: wherein: X is selected from heteroaryl etc., Y1 and Y2 are selected from —N? etc., Y3 and Y4 are selected from —CH? etc., A is selected from sulfamide etc., R1 is selected from hydrogen etc., and R2 is selected from C1-6 alkyl etc. The compound or salt has sufficiently high antitumor activity, and is useful in the treatment of cell proliferative disorders, particularly cancers. The present invention also provides a pharmaceutical composition containing the compound or salt as an active ingredient.
    Type: Grant
    Filed: February 9, 2007
    Date of Patent: March 1, 2011
    Assignees: Chugai Seiyaku Kabushiki Kaisha
    Inventors: Hitoshi Iikura, Ikumi Hyoudoh, Toshihiro Aoki, Noriyuki Furuichi, Masayuki Matsushita, Fumio Watanabe, Sawako Ozawa, Masahiro Sakaitani, Pil-Su Ho, Yasushi Tomii, Kenji Takanashi, Naoki Harada
  • Publication number: 20110009398
    Abstract: The present invention provides a p27 protein inducing agent comprising a compound represented by general formula (11) below or pharmaceutically acceptable salt thereof as an active ingredient: wherein G1, G2, G3 and G8 are each independently selected from —N? etc., Ring G6 is selected from divalent aryl etc., A is selected from amino etc., G4 is selected from oxygen etc., G5 is selected from oxygen etc., G7 is selected from —CH2— etc., and R2 is selected from C1-6 alkyl etc.
    Type: Application
    Filed: July 18, 2008
    Publication date: January 13, 2011
    Inventors: Toshiyuki Sakai, Hitoshi Iikura, Ikumi Hyoudoh, Toshihiro Aoki, Noriyuki Furuichi, Masayuki Matsushita, Fumio Watanabe, Sawako Ozawa, Masahiro Sakaitani, Pil-Su Ho, Yasushi Tomii, Kenji Takanashi, Naoki Harada
  • Publication number: 20100197676
    Abstract: An objective of the present invention is to provide compounds that exhibit strong MEK-inhibiting activity and are stable in vivo and soluble in water, which can be used as preventive or therapeutic agents for proliferative diseases. The compounds of the present invention and pharmaceutically acceptable salts thereof are represented by the following formula (1): [where R1, R2, R3, R4, and X are the same as defined in the present patent application].
    Type: Application
    Filed: April 1, 2010
    Publication date: August 5, 2010
    Applicant: Chugai Seiyaku Kabushiki Kaisha
    Inventors: Yoshiaki Isshiki, Yasunori Kohchi, Eisaku Mizuguchi, Hitoshi Iikura, Yasuaki Matsubara, Shinji Tsujii, Nobuo Shimma, Masanori Miwa, Satoshi Aida, Masami Kohchi, Takeshi Murata, Kosuke Aso
  • Patent number: 7745663
    Abstract: An objective of the present invention is to provide compounds that exhibit strong MEK-inhibiting activity and are stable in vivo and soluble in water, which can be used as preventive or therapeutic agents for proliferative diseases. The compounds of the present invention and pharmaceutically acceptable salts thereof are represented by the following formula (1): [where R1, R2, R3, R4, and X are the same as defined in the present patent application].
    Type: Grant
    Filed: July 26, 2005
    Date of Patent: June 29, 2010
    Assignee: Chugai Seiyaku Kabushiki Kaisha
    Inventors: Yoshiaki Isshiki, Yasunori Kohchi, Eisaku Mizuguchi, Hitoshi Iikura, Yasuaki Matsubara, Shinji Tsujii, Nobuo Shimma, Masanori Miwa, Satoshi Aida, Masami Kohchi, Takeshi Murata, Kosuke Aso
  • Publication number: 20100004233
    Abstract: The present invention provides a compound represented by general formula (1) below or a pharmaceutically acceptable salt thereof: wherein: X is selected from heteroaryl etc., Y1 and Y2 are selected from —N? etc., Y3 and Y4 are selected from —CH? etc., A is selected from sulfamide etc., R1 is selected from hydrogen etc., and R2 is selected from C1-6 alkyl etc. The compound or salt has sufficiently high antitumor activity, and is useful in the treatment of cell proliferative disorders, particularly cancers. The present invention also provides a pharmaceutical composition containing the compound or salt as an active ingredient.
    Type: Application
    Filed: February 9, 2007
    Publication date: January 7, 2010
    Inventors: Hitoshi Iikura, Ikumi Hyoudoh, Toshihiro Aoki, Noriyuki Furuichi, Masayuki Matsushita, Fumio Watanabe, Sawako Ozawa, Masahiro Sakaitani, Pil-Su Ho, Yasushi Tomii, Kenji Takanashi, Naoki Harada
  • Publication number: 20090233915
    Abstract: An objective of the present invention is to provide compounds that exhibit strong MEK-inhibiting activity and are stable in vivo and soluble in water, which can be used as preventive or therapeutic agents for proliferative diseases. The compounds of the present invention and pharmaceutically acceptable salts thereof are represented by the following formula (1): [where R1, R2, R3, R4, and X are the same as defined in the present patent application].
    Type: Application
    Filed: July 26, 2005
    Publication date: September 17, 2009
    Inventors: Yoshiaki Isshiki, Yasunori Kohchi, Eisaku Mizuguchi, Hitoshi Iikura, Yasuaki Matsubara, Shinji Tsujii, Nobuo Shimma, Masanori Miwa, Satoshi Aida, Masami Kohchi, Takeshi Murata, Kosuke Aso
  • Publication number: 20090209785
    Abstract: The invention provides a process for production of 2,3,4-trifluoro-5-(iodo or bromo)benzoic acid, the process comprising a halogenation step in which direct iodination or bromination of 2,3,4-trifluorobenzoic acid is performed with an iodinating agent or brominating agent in a reaction solvent in the presence of an oxidizing agent. According to the invention, there is provided a process for convenient production of 2,3,4-trifluoro-5-(iodo or bromo)benzoic acid in high yield and high purity in a highly regioselective manner.
    Type: Application
    Filed: April 6, 2006
    Publication date: August 20, 2009
    Inventors: Hiroshi Koyano, Hitoshi Iikura, Yoshiaki Isshiki, Yasunori Kohchi