Patents by Inventor Kazuhiro Yoshizawa

Kazuhiro Yoshizawa 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: 20220194925
    Abstract: The present application discloses a method and a compound that are useful for preparation of a compound of Formula (XI). Furthermore, the present application discloses the compound of Formula (XI) comprising a small amount of impurities.
    Type: Application
    Filed: May 13, 2020
    Publication date: June 23, 2022
    Inventors: Taichi Abe, Kazuhiro Yoshizawa, Yuzo Watanabe, Takeshi Miura, Yusuke Ayata, Yoshinori Yasuda
  • Patent number: 9227942
    Abstract: 5-(Difluoromethyl)pyrazine-2-carboxylic acid, which is a raw material for the construction of 5-(difluoromethyl)pyrazine-2-carboxamide, which is a common partial structural motif of the compound having an A? production inhibitory action or a BACE1 inhibitory action, can be industrially advantageously produced by decarboxylating 5-[carboxy(difluoro)methyl]pyrazine-2-carboxylic acid, which is obtainable from 5-chloropyrazine-2-carboxylate.
    Type: Grant
    Filed: April 25, 2013
    Date of Patent: January 5, 2016
    Assignee: Eisai R&D Management Co., Ltd.
    Inventors: Kazuhiro Yoshizawa, Masayuki Omori, Yuzo Watanabe, Mitsuo Nagai, Masabumi Takahashi, Francis G. Fang
  • Publication number: 20150087836
    Abstract: 5-(Difluoromethyl)pyrazine-2-carboxilic acid, which is a raw material for the construction of 5-(difluoromethyl)pyrazine-2-carboxamide, which is a common partial structural motif of the compound having an A production inhibitory action or a BACE1 inhibitory action, can be industrially advantageously produced by decarboxylating 5-[carboxy(difluoro)methyl]pyrazine-2-carboxylic acid, which is obtainable from 5-chloropyrazine-2-carboxylate.
    Type: Application
    Filed: April 25, 2013
    Publication date: March 26, 2015
    Inventors: Kazuhiro Yoshizawa, Masayuki Omori, Yuzo Watanabe, Mitsuo Nagai, Masabumi Takahashi, Francis G. Fang
  • Patent number: 8426584
    Abstract: Provided are compounds and methods useful for the preparation of compounds useful as inhibitors of beta-site amyloid precursor protein (APP)-cleaving enzyme.
    Type: Grant
    Filed: January 20, 2012
    Date of Patent: April 23, 2013
    Assignee: Eisai R&D Management Co., Ltd.
    Inventors: Branko Mitasev, Dae-Shik Kim, Kazuhiro Yoshizawa
  • Patent number: 8410277
    Abstract: It is an object of the present invention to provide an efficient method for manufacturing heterocycle-substituted pyridine derivatives. The present invention provides a method for manufacturing a compound represented by the following formula (I): the method including reacting a compound represented by the following formula (III): and a compound represented by the following formula (II): in a solvent and in the presence of a palladium catalyst and a base, wherein R1 represents a hydrogen atom, etc.; R2 represents a hydrogen atom, a C1-6 alkyl group, an amino group that may be protected with a protective group, etc.; one of X and Y represents a nitrogen atom and the other represents a nitrogen atom or an oxygen atom; Q represents a leaving group; the ring A represents a 5- or 6-member heteroaryl ring or a benzene ring, which may have one or two halogen atoms or C1-6 alkyl groups; Z represents a single bond, a methylene group, an ethylene group, an oxygen atom, etc.
    Type: Grant
    Filed: December 25, 2008
    Date of Patent: April 2, 2013
    Assignee: Eisai R&D Managment Co., Ltd.
    Inventors: Jun Niijima, Kazuhiro Yoshizawa, Yuki Kosaka, Shinya Abe
  • Patent number: 8267016
    Abstract: An open/close control system for an inspection lid adapted not to open while a vehicle travels. An emergency release device is provided behind the inspection lid, where the emergency release device disables power transmission of a driver which opens and closes a side entrance/exit door of a railway vehicle. The emergency release device is installed in a space inside a wall surface inside the vehicle, and the space can be opened and closed by the inspection lid. The open/close control system has a locking device provided in the space inside the wall surface in order to restrict rotation of the inspection lid, and also has an open/close controller which detects traveling of the railway vehicle to actuate the locking device.
    Type: Grant
    Filed: June 18, 2008
    Date of Patent: September 18, 2012
    Assignees: Nippon Sharyo, Ltd., Central Japan Railway Company
    Inventors: Haruo Akoshita, Mitsuaki Murota, Minoru Nakao, Mamoru Tanaka, Kouji Yokoyama, Kazuhiro Yoshizawa
  • Publication number: 20120190848
    Abstract: Provided are compounds and methods useful for the preparation of compounds useful as inhibitors of beta-site amyloid precursor protein (APP)-cleaving enzyme.
    Type: Application
    Filed: January 20, 2012
    Publication date: July 26, 2012
    Inventors: Branko Mitasev, Dae-Shik Kim, Huiming Zhang, Matthew J. Schnaderbeck, Christopher N. Farthing, Kazuhiro Yoshizawa
  • Publication number: 20110263845
    Abstract: It is an object of the present invention to provide an efficient method for manufacturing heterocycle-substituted pyridine derivatives. The present invention provides a method for manufacturing a compound represented by the following formula (I): the method including reacting a compound represented by the following formula (III): and a compound represented by the following formula (II): in a solvent and in the presence of a palladium catalyst and a base, wherein R1 represents a hydrogen atom, etc.; R2 represents a hydrogen atom, a C1-6 alkyl group, an amino group that may be protected with a protective group, etc.; one of X and Y represents a nitrogen atom and the other represents a nitrogen atom or an oxygen atom; Q represents a leaving group; the ring A represents a 5- or 6-member heteroaryl ring or a benzene ring, which may have one or two halogen atoms or C1-6 alkyl groups; Z represents a single bond, a methylene group, an ethylene group, an oxygen atom, etc.
    Type: Application
    Filed: December 25, 2008
    Publication date: October 27, 2011
    Applicant: Eisai R&D Management Co., Ltd.
    Inventors: Jun Niijima, Kazuhiro Yoshizawa, Yuki Kosaka, Shinya Abe
  • Publication number: 20110172427
    Abstract: This invention relates to a new synthesis, intermediates and precursors leading to a mixture of the compounds 11 and 12 as shown below. It also relates to the resolution of the stereoisomeric mixture to provide in substantial stereochemical purity compound 12. The synthesis of the invention involves preparation of compound 7 and compound 10 as shown below and their reaction to prepare a mixture of compound 11 and compound 12.
    Type: Application
    Filed: August 26, 2009
    Publication date: July 14, 2011
    Applicant: EISAI R&D MANAGEMENT CO., LTD.
    Inventors: Taiju Nakamura, Masaaki Matsuda, Yongbo Hu, Daiju Hasegawa, Yorihisa Hoshino, Kazato Inanaga, Minetaka Isomura, Nobuaki Sato, Kazuhiro Yoshizawa, George A. Moniz, Gordon D. Wilkie, Francis G. Fang, Yoshihiro Nishikawa
  • Publication number: 20100126075
    Abstract: An open/close control system for an inspection lid adapted not to open while a vehicle travels. The open/close control system has emergency release means which disables power transmission of drive means for opening and closing a side entrance/exit door of a railway vehicle. The emergency release means is installed in a space inside a wall surface inside the vehicle, and the space can be opened and closed by the inspection lid. The emergency release means has locking devices provided in the space inside the wall surface in order to restrict rotation of the inspection lid, and also has an open/close controller for detecting traveling of the railway vehicle to actuate the locking device.
    Type: Application
    Filed: June 18, 2008
    Publication date: May 27, 2010
    Applicant: NIPPON SHARYO, LTD
    Inventors: Haruo Akoshita, Mitsuaki Murota, Minoru Nakao, Mamoru Tanaka, Kouji Yokoyama, Kazuhiro Yoshizawa
  • Publication number: 20100094001
    Abstract: The present invention provides a process or the like which is employed for producing chloromethyl phosphate derivatives that are useful for producing water-soluble prodrugs, and which are excellent from the points of view of workability, operativity and energy saving. According to the present invention, there is provided a process for producing a composition containing a compound represented by the following formula (I) and a tertiary amine, (wherein R1 and R2 are identical or different from each other, and represent a C1-C6 alkyl group, a C2-C6 alkenyl group or a C6-C14 aryl C1-C6 alkyl group which may have a substituent, and R1 and R2 may together form a ring), the process comprising the step of adding the tertiary amine having a boiling point at 1 atmosphere of 150° C. or higher to the compound represented by formula (I).
    Type: Application
    Filed: March 5, 2008
    Publication date: April 15, 2010
    Applicant: Eisai R&D Management Co., Ltd.
    Inventors: Keizo Sato, Shinya Abe, Kazuhiro Yoshizawa, Kazunori Wakasugi, Shigeto Negi, Mamoru Miyazawa
  • Patent number: 7683172
    Abstract: A process for preparing a compound (C) represented by the following formula: wherein R1 represents hydrogen, C1-6 alkyl or C3-8 cycloalkyl, and R2 represents hydrogen or methoxy, characterized by reacting a compound (A-1) represented by the following formula: wherein R1 has the same definition as above, with a compound (B) represented by the following formula: wherein R2 has the same definition as above, and L represents a leaving group, is provided. Compound (C) is effective for prevention or treatment of various diseases associated with angiogenesis neoplasia.
    Type: Grant
    Filed: November 8, 2004
    Date of Patent: March 23, 2010
    Assignee: Eisai R&D Management Co., Ltd.
    Inventors: Toshihiko Naito, Kazuhiro Yoshizawa
  • Patent number: 7612208
    Abstract: A crystal of a 4-(3-chloro-4-(cyclopropylaminocarbonyl)aminophenoxy)-7-methoxy-6-quinolinecarboxamide hydrochloride, hydrobromide, p-toluenesulfonate, sulfate, methanesulfonate or ethanesulfonate, or a solvate thereof.
    Type: Grant
    Filed: December 22, 2004
    Date of Patent: November 3, 2009
    Assignee: Eisai R&D Management Co., Ltd.
    Inventors: Tomohiro Matsushima, Taiju Nakamura, Kazuhiro Yoshizawa, Atsushi Kamada, Yusuke Ayata, Naoko Suzuki, Itaru Arimoto, Takahisa Sakaguchi, Masaharu Gotoda
  • Patent number: 7585982
    Abstract: The present invention relates to a method for producing an isoindole derivative (compound (II)) with the following general formula (II): (wherein R1 and R2 each independently represents a C1-6 alkyl group) or a salt thereof, comprising the step of cyclizing, in a solvent, compound (I) with the following general formula (I): (wherein R1 and R2 have the same meanings as R1 and R2 in formula (II) above) or a salt thereof, or their hydrate or solvate in the presence of a base (Step 1).
    Type: Grant
    Filed: July 27, 2005
    Date of Patent: September 8, 2009
    Assignee: Eisai R&D Management Co., Ltd.
    Inventors: Kazuhiro Yoshizawa, Taiju Nakamura, Shigeto Negi
  • Publication number: 20090171112
    Abstract: A process for preparing a compound (C) represented by the following formula: wherein R1 represents hydrogen, C1-6 alkyl or C3-8 cycloalkyl, and R2 represents hydrogen or methoxy, characterized by reacting a compound (A-1) represented by the following formula: wherein R1 has the same definition as above, with a compound (B) represented by the following formula: wherein R2 has the same definition as above, and L represents a leaving group, is provided. Compound (C) is effective for prevention or treatment of various diseases associated with angiogenesis neoplasia.
    Type: Application
    Filed: March 9, 2009
    Publication date: July 2, 2009
    Inventors: Toshihiko Naito, Kazuhiro Yoshizawa
  • Publication number: 20080214834
    Abstract: The present invention relates to a method for producing an isoindole derivative (compound (II)) with the following general formula (II): (wherein R1 and R2 each independently represents a C1-6 alkyl group) or a salt thereof, comprising the step of cyclizing, in a solvent, compound (I) with the following general formula (I): (wherein R1 and R2 have the same meanings as R1 and R2 in formula (II) above) or a salt thereof, or their hydrate or solvate in the presence of a base (Step 1).
    Type: Application
    Filed: July 27, 2005
    Publication date: September 4, 2008
    Applicant: Eisai R&D Management Co., Ltd.
    Inventors: Kazuhiro Yoshizawa, Taiju Nakamura, Shigeto Negi
  • Patent number: 7375236
    Abstract: In the present invention, the methods of producing a fluorinated cyclic benzamidine derivative (A), or a salt thereof, comprise the step of reacting a specific novel compound with ammonia or imide. The methods of this invention for producing a morpholine-substituted phenacyl derivative (B), or a salt thereof, comprise reaction of a specific novel compound with morpholine, reaction of the product with a halogenating reagent, and deketalization of the product. The methods of this invention for a producing cyclic benzamidine derivative (C), or a salt thereof, comprise the step of coupling compound (A), or a salt thereof, with compound (B), or a salt thereof, in the presence of an ether or a hydrocarbon.
    Type: Grant
    Filed: August 18, 2005
    Date of Patent: May 20, 2008
    Assignee: Eisai Co., Ltd.
    Inventors: Naoyuki Shimomura, Manabu Sasho, Akio Kayano, Kazuhiro Yoshizawa, Masahiko Tsujii, Hiroshi Kuroda, Ken Furukawa
  • Publication number: 20070117842
    Abstract: A polymorph (A) of 4-(3-chloro-4-(cyclopropylaminocarbonyl)aminophenoxy)-7-methoxy-6-quinolinecarboxamide, having a diffraction peak at a diffraction angle (2?±0.2°) of 15.75° in a powder X-ray diffraction; and a polymorph (B) of 4-[3-chloro-4-(cyclopropylaminocarbonyl)aminophenoxy]-7-methoxy-6-quinolinecarboxamide, having a diffraction peak at a diffraction angle (2?±0.2°) of 21.75° in a powder X-ray diffraction.
    Type: Application
    Filed: April 22, 2004
    Publication date: May 24, 2007
    Inventors: Itaru Arimoto, Kazuhiro Yoshizawa, Atsushi Kamada
  • Publication number: 20070037849
    Abstract: A process for preparing a compound (C) represented by the following formula: wherein R1 represents hydrogen, C1-6 alkyl or C3-8 cycloalkyl, and R2 represents hydrogen or methoxy, characterized by reacting a compound (A-1) represented by the following formula: wherein R1 has the same definition as above, with a compound (B) represented by the following formula: wherein R2 has the same definition as above, and L represents a leaving group, is provided. Compound (C) is effective for prevention or treatment of various diseases associated with angiogenesis neoplasia.
    Type: Application
    Filed: November 8, 2004
    Publication date: February 15, 2007
    Inventors: Toshihiko Naito, Kazuhiro Yoshizawa
  • Publication number: 20060058370
    Abstract: In the present invention, the methods of producing a fluorinated cyclic benzamidine derivative (A), or a salt thereof, comprise the step of reacting a specific novel compound with ammonia or imide. The methods of this invention for producing a morpholine-substituted phenacyl derivative (B), or a salt thereof, comprise reaction of a specific novel compound with morpholine, reaction of the product with a halogenating reagent, and deketalization of the product. The methods of this invention for a producing cyclic benzamidine derivative (C), or a salt thereof, comprise the step of coupling compound (A), or a salt thereof, with compound (B), or a salt thereof, in the presence of an ether or a hydrocarbon.
    Type: Application
    Filed: August 18, 2005
    Publication date: March 16, 2006
    Applicant: Eisai Co., Ltd.
    Inventors: Naoyuki Shimomura, Manabu Sasho, Akio Kayano, Kazuhiro Yoshizawa, Masahiko Tsujii, Hiroshi Kuroda, Ken Furukawa