Patents by Inventor Hiroaki Sasai

Hiroaki Sasai 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: 7351835
    Abstract: A novel organic molecular catalysts represented by the following formula (1) or (2): and a method for carrying out asymmetric reactions/asymmetric synthesis using these organic molecular catalysts.
    Type: Grant
    Filed: March 10, 2005
    Date of Patent: April 1, 2008
    Assignee: Meiji Seika Kaisha Ltd.
    Inventors: Hiroaki Sasai, Shinobu Takizawa, Katsuya Matsui
  • Patent number: 7205425
    Abstract: Optically active 1-substituted phenyl-2-nitro alcohol derivatives having the formula (1) and the process for producing thereof, and 1-substituted phenyl-2-amino alcohol derivatives having the formula (2) and the process for producing thereof from the optically active 1-substituted phenyl-2-nitro alcohol derivatives. From these nitro alcohols, pharmaceuticals such as (R)-albutamin and (R)-sarmeterol useful as a bronchodilator is obtained via optically active amino alcohols which are useful pharmaceutical intermediates.
    Type: Grant
    Filed: January 28, 2005
    Date of Patent: April 17, 2007
    Assignee: Chisso Corporation
    Inventors: Masakatsu Shibasaki, Hiroaki Sasai, Yasuo Urata, Mamoru Fujita
  • Publication number: 20070060656
    Abstract: Optically active 1-substituted phenyl-2-nitro alcohol derivatives having the formula (1) and the process for producing thereof, and 1-substituted phenyl-2-amino alcohol derivatives having the formula (2) and the process for producing thereof from the optically active 1-substituted phenyl-2-nitro alcohol derivatives. From these nitro alcohols, pharmaceuticals such as (R)-albutamin and (R)-sarmeterol useful as a bronchodilator is obtained via optically active amino alcohols which are useful pharmaceutical intermediates.
    Type: Application
    Filed: November 13, 2006
    Publication date: March 15, 2007
    Inventors: Masakatsu Shibasaki, Hiroaki Sasai, Yasuo Urata, Mamoru Fujita
  • Publication number: 20060009646
    Abstract: A novel organic molecular catalysts represented by the following formula (1) or (2): and a method for carrying out asymmetric reactions/asymmetric synthesis using these organic molecular catalysts.
    Type: Application
    Filed: March 10, 2005
    Publication date: January 12, 2006
    Applicant: Meiji Seika Kaisha Ltd.
    Inventors: Hiroaki Sasai, Shinobu Takizawa, Katsuya Matsui
  • Publication number: 20050148801
    Abstract: Optically active 1-substituted phenyl-2-nitro alcohol derivatives having the formula (1) and the process for producing thereof, and 1-substituted phenyl-2-amino alcohol derivatives having the formula (2) and the process for producing thereof from the optically active 1-substituted phenyl-2-nitro alcohol derivatives. From these nitro alcohols, pharmaceuticals such as (R)-albutamin and (R)-sarmeterol useful as a bronchodilator is obtained via optically active amino alcohols which are useful pharmaceutical intermediates.
    Type: Application
    Filed: January 28, 2005
    Publication date: July 7, 2005
    Inventors: Masakatsu Shibasaki, Hiroaki Sasai, Yasuo Urata, Mamoru Fujita
  • Patent number: 6632955
    Abstract: Optically active 1-substituted phenyl-2-nitro alcohol derivatives having the formula (1) and the process for producing thereof, and 1-substituted phenyl-2-amino alcohol derivatives having the formula (2) and the process for producing thereof from the optically active 1-substituted phenyl-2-nitro alcohol derivatives. From these nitro alcohols, pharmaceuticals such as (R)-albutamin and (R)-sarmeterol useful as a bronchodilator is obtained via optically active amino alcohols which are useful pharmaceutical intermediates.
    Type: Grant
    Filed: September 1, 1999
    Date of Patent: October 14, 2003
    Assignee: Chisso Corporation
    Inventors: Masakatsu Shibasaki, Hiroaki Sasai, Yasuo Urata, Mamoru Fujita
  • Publication number: 20020193447
    Abstract: Optically active 1-substituted phenyl-2-nitro alcohol derivatives having the formula (1) 1
    Type: Application
    Filed: July 5, 2002
    Publication date: December 19, 2002
    Inventors: Masakatsu Shibasaki, Hiroaki Sasai, Yasuo Urata, Mamoru Fujita
  • Patent number: 6090969
    Abstract: A process for producing an asymmetric compound using a metal complex containing no rare earth metal element is disclosed. The process affords an optically active compound having high optical purity. Optically active binaphthol having the chemical formula and lithium aluminum hydride are reacted, or the optically active binaphthol, a dialkyl aluminum hydride, and a base containing an alkali metal (or a base containing alkaline earth metal) are reacted to prepare a metal complex comprising optically active binaphthol, aluminum, and alkali metal (or alkaline earth metal). This metal complex can be used as a catalyst to perform an asymmetric Michael reaction, an asymmetric phosphonylation reaction, or the like, to obtain, in a high yield, an asymmetric compound having high optical purity.
    Type: Grant
    Filed: September 8, 1998
    Date of Patent: July 18, 2000
    Assignee: Nagase and Co., Ltd.
    Inventors: Masakatsu Shibasaki, Hiroaki Sasai, Takayoshi Arai
  • Patent number: 6084123
    Abstract: Provided is a process for the preparation of an optically active (R)- or (S)-1-aminophosphonic acid derivative of the general formula (Ia) or (Ib) given below, which process comprises reacting an amino-protected imine having general formula (II): R.sup.1 --N.dbd.CHR.sup.2 where R.sup.1 is diphenylmethyl group or the like and R.sup.2 is an alkyl group or the like, with a phosphonic acid ester in the presence of an asymmetric catalyst consisting of a rare earth element-alkali metal-binaphthol complex, to produce an (R)- or (S)-N-protected-1-aminophosphonate compound, and then subjecting the phosphonate compound to catalytic reduction with hydrogen and to acidic hydrolysis. ##STR1## There are also provided novel intermediates, and a process of preparing an asymmetric catalyst consisting of a rare element-alkali metal-binaphthol complex.
    Type: Grant
    Filed: May 20, 1998
    Date of Patent: July 4, 2000
    Assignee: Hokko Chemical Industry Co., Ltd.
    Inventors: Masakatsu Shibasaki, Hiroaki Sasai, Yoshihiro Tahara
  • Patent number: 5847186
    Abstract: A process for producing an asymmetric compound using a metal complex containing no rare earth metal element is disclosed. The process affords an optically active compound having high optical purity. Optically active binaphthol having the chemical formula ##STR1## and lithium aluminum hydride are reacted, or the optically active binaphthol, a dialkyl aluminum hydride, and a base containing an alkali metal (or a base containing alkaline earth metal) are reacted to prepare a metal complex comprising optically active binaphthol, aluminum, and alkali metal (or alkaline earth metal). This metal complex can be used as a catalyst to perform an asymmetric Michael reaction, an asymmetric phosphonylation reaction, or the like, to obtain, in a high yield, an asymmetric compound having high optical purity.
    Type: Grant
    Filed: December 5, 1997
    Date of Patent: December 8, 1998
    Assignee: Nagase & Company, Ltd.
    Inventors: Masakatsu Shibasaki, Hiroaki Sasai, Takayoshi Arai
  • Patent number: 5336653
    Abstract: The present invention provides a catalyst for asymmetric synthesis prepared from a dialkali metal salt of an optically active 2,2'-dihydroxy-1,1'-binaphthyl represented by the formula (I.sub.R) ##STR1## or the formula (I.sub.S) ##STR2## (wherein M is Li, K or Na), a lanthanum compound represented by LaX.sub.3 (X is F, Cl, Br, I, NO.sub.3 or CH.sub.3 CO.sub.2) and an alkali metal alkoxide or an alkali metal hydroxide represented by MOR or MOH (M is Li, K or Na, and R is isopropyl or t-butyl), respectively, in the presence of a water-containing solvent. The catalyst of the present invention is extremely valuable as a catalyst for asymmetric synthesis of an asymmetric nitroaldol reaction useful in the synthesis of a .beta.-hydroxynitro compound which is an important synthetic raw material for an optically active compound such as a medicine.
    Type: Grant
    Filed: November 3, 1992
    Date of Patent: August 9, 1994
    Assignee: Chisso Corporation
    Inventors: Masakatsu Shibasaki, Hiroaki Sasai