Patents by Inventor Michiaki Kawahara

Michiaki Kawahara 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).

  • Patent number: 9776961
    Abstract: The present invention provides a production intermediate of an atropisomer of a pyrrole derivative having excellent mineralocorticoid receptor antagonistic activity, a method for producing the same, and a crystal thereof. A method for producing an atropisomer of a pyrrole derivative including a step of resolving a compound represented by the following general formula (I) [wherein R1 represents a methyl group or a trifluoromethyl group, R2 represents a hydrogen atom or a C1-C3 alkoxy group, and n represents an integer selected from 1 to 3] into its atropisomers, characterized by using an optically active amine having a cinchonine skeletal formula, and a crystal of (S)-1-(2-hydroxyethyl)-4-methyl-N-[4-(methylsulfonyl)phenyl]-5-[2-(trifluoromethyl)phenyl]-1H-pyrrole-3-carboxamide.
    Type: Grant
    Filed: April 28, 2017
    Date of Patent: October 3, 2017
    Assignee: Daiichi Sankyo Company, Limited
    Inventors: Masashi Watanabe, Takahiro Okachi, Michiaki Kawahara, Hiroshi Nagasawa, Noritada Sato, Takashi Takita, Gen Hasegawa
  • Publication number: 20170233341
    Abstract: The present invention provides a production intermediate of an atropisomer of a pyrrole derivative having excellent mineralocorticoid receptor antagonistic activity, a method for producing the same, and a crystal thereof. A method for producing an atropisomer of a pyrrole derivative including a step of resolving a compound represented by the following general formula (I) [wherein R1 represents a methyl group or a trifluoromethyl group, R2 represents a hydrogen atom or a C1-C3 alkoxy group, and n represents an integer selected from 1 to 3] into its atropisomers, characterized by using an optically active amine having a cinchonine skeletal formula, and a crystal of (S)-1-(2-hydroxyethyl)-4-methyl-N-[4-(methylsulfonyl)phenyl]-5-[2-(trifluoromethyl)phenyl]-1H-pyrrole-3-carboxamide.
    Type: Application
    Filed: April 28, 2017
    Publication date: August 17, 2017
    Applicant: Daiichi Sankyo Company, Limited
    Inventors: Masashi Watanabe, Takahiro Okachi, Michiaki Kawahara, Hiroshi Nagasawa, Noritada Sato, Takashi Takita, Gen Hasegawa
  • Patent number: 9676713
    Abstract: The present invention provides a production intermediate of an atropisomer of a pyrrole derivative having excellent mineralocorticoid receptor antagonistic activity, a method for producing the same, and a crystal thereof. A method for producing an atropisomer of a pyrrole derivative including a step of resolving a compound represented by the following general formula (I) [wherein R1 represents a methyl group or a trifluoromethyl group, R2 represents a hydrogen atom or a C1-C3 alkoxy group, and n represents an integer selected from 1 to 3] into its atropisomers, characterized by using an optically active amine having a cinchonine skeletal formula, and a crystal of (S)-1-(2-hydroxyethyl)-4-methyl-N-[4-(methylsulfonyl)phenyl]-5-[2-(trifluoromethyl)phenyl]-1H-pyrrole-3-carboxamide.
    Type: Grant
    Filed: November 15, 2016
    Date of Patent: June 13, 2017
    Assignee: Daiichi Sankyo Company, Limited
    Inventors: Masashi Watanabe, Takahiro Okachi, Michiaki Kawahara, Hiroshi Nagasawa, Noritada Sato, Takashi Takita, Gen Hasegawa
  • Publication number: 20170057915
    Abstract: The present invention provides a production intermediate of an atropisomer of a pyrrole derivative having excellent mineralocorticoid receptor antagonistic activity, a method for producing the same, and a crystal thereof. A method for producing an atropisomer of a pyrrole derivative including a step of resolving a compound represented by the following general formula (I) [wherein R1 represents a methyl group or a trifluoromethyl group, R2 represents a hydrogen atom or a C1-C3 alkoxy group, and n represents an integer selected from 1 to 3] into its atropisomers, characterized by using an optically active amine having a cinchonine skeletal formula, and a crystal of (S)-1-(2-hydroxyethyl)-4-methyl-N-[4-(methylsulfonyl)phenyl]-5-[2-(trifluoromethyl)phenyl]-1H-pyrrole-3-carboxamide.
    Type: Application
    Filed: November 15, 2016
    Publication date: March 2, 2017
    Applicant: Daiichi Sankyo Company, Limited
    Inventors: Masashi Watanabe, Takahiro Okachi, Michiaki Kawahara, Hiroshi Nagasawa, Noritada Sato, Takashi Takita, Gen Hasegawa
  • Patent number: 9499483
    Abstract: The present invention provides a production intermediate of an atropisomer of a pyrrole derivative having excellent mineralocorticoid receptor antagonistic activity, a method for producing the same, and a crystal thereof. A method for producing an atropisomer of a pyrrole derivative including a step of resolving a compound represented by the following general formula (I) [wherein R1 represents a methyl group or a trifluoromethyl group, R2 represents a hydrogen atom or a C1-C3 alkoxy group, and n represents an integer selected from 1 to 3] into its atropisomers, characterized by using an optically active amine having a cinchonine skeletal formula, and a crystal of (S)-1-(2-hydroxyethyl)-4-methyl-N-[4-(methylsulfonyl)phenyl]-5-[2-(trifluoromethyl)phenyl]-1H-pyrrole-3-carboxamide.
    Type: Grant
    Filed: October 9, 2015
    Date of Patent: November 22, 2016
    Assignee: Daiichi Sankyo Company, Limited
    Inventors: Masashi Watanabe, Takahiro Okachi, Michiaki Kawahara, Hiroshi Nagasawa, Noritada Sato, Takashi Takita, Gen Hasegawa
  • Publication number: 20160096803
    Abstract: The present invention provides a production intermediate of an atropisomer of a pyrrole derivative having excellent mineralocorticoid receptor antagonistic activity, a method for producing the same, and a crystal thereof. A method for producing an atropisomer of a pyrrole derivative including a step of resolving a compound represented by the following general formula (I) [wherein R1 represents a methyl group or a trifluoromethyl group, R2 represents a hydrogen atom or a C1-C3 alkoxy group, and n represents an integer selected from 1 to 3] into its atropisomers, characterized by using an optically active amine having a cinchonine skeletal formula, and a crystal of (S)-1-(2-hydroxyethyl)-4-methyl-N-[4-(methylsulfonyl)phenyl]-5-[2-(trifluoromethyl)phenyl]-1H-pyrrole-3-carboxamide.
    Type: Application
    Filed: October 9, 2015
    Publication date: April 7, 2016
    Applicant: Daiichi Sankyo Company, Limited
    Inventors: Masashi Watanabe, Takahiro Okachi, Michiaki Kawahara, Hiroshi Nagasawa, Noritada Sato, Takashi Takita, Gen Hasegawa