Patents by Inventor Jean-Pierre Duchesne

Jean-Pierre Duchesne 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).

  • .beta.-phenylisoserine-(2R,3S), salts, preparation and use thereof
    Patent number: 5684168
    Abstract: .beta.-phenylisiserine-(2R,3S), salts and preparation thereof through the action of ammonia on .beta.-phenylglycidic-(2R,3R) acid and its use in the preparation of taxane derivatives of general formula: ##STR1## wherein R is hydrogen or --COCH.sub.3 ;and R.sub.1 is phenyl or --O--C(CH.sub.3).sub.3.
    Type: Grant
    Filed: April 10, 1995
    Date of Patent: November 4, 1997
    Assignee: Rhone-Poulenc Rorer S.A.
    Inventors: Jean-Pierre Duchesne, Max Ferraro
  • .beta.-phenylisoserine derivative, its preparation and its use
    Patent number: 5359124
    Abstract: New .beta.-phenylisoserine derivative of formula (I), its preparation and its use as intermediate in the synthesis of taxol or of its derivatives.
    Type: Grant
    Filed: August 21, 1992
    Date of Patent: October 25, 1994
    Inventors: Jean-Pierre Duchesne, Michel Mulhauser
  • Process for the preparation of (2R,3R)-cis)-.beta.-phenylglycidic acid
    Patent number: 5256803
    Abstract: A method for preparing .beta.-phenylglycidic-(2R, 3R) acid optionally in the form of salt or ester by precipitation of the salt of the .beta.-phenylglycidic-(2R,3R) acid with (+)-.alpha.-methylbenzylamine-(R) in a solution of a mixture of salts of cis and trans .beta.-phenylglycidic acids with (+)-.alpha.-methylbenzylamine(R)- and the use of the resulting product for preparing taxol and its analogs.
    Type: Grant
    Filed: August 21, 1992
    Date of Patent: October 26, 1993
    Assignee: Rhone-Poulenc Rorer S.A.
    Inventors: Jean-Pierre Duchesne, Michel Mulhauser
  • Sulpholenes and processes for their preparation and use
    Patent number: 5128486
    Abstract: A sulpholene compound and more particularly 4,4-dimethyl-2,2-dioxo-1,2,4,5,6,7-hexahydro-benzo[c]thiophene. These compounds are prepared by bringing myrcene sulphone into contact with a strong acid. The compounds of the present invention can be used as synthesis intermediates in the preparation of vitamin A.
    Type: Grant
    Filed: August 14, 1991
    Date of Patent: July 7, 1992
    Assignee: Rhone-Poulenc Nutrition Animale
    Inventor: Jean-Pierre Duchesne
  • Sulpholenes and processes for their preparation and use
    Patent number: 5124499
    Abstract: A sulpholene compound and more particularly 4,4-dimethyl-2,2-dioxo-1,2,4,5,6,7-hexahydro-benzo[c]thiophene. These compounds are prepared by bringing myrcene sulphone into contact with a strong acid. The compounds of the present invention can be used as synthesis intermediates in the preparation of vitamin A.
    Type: Grant
    Filed: August 2, 1991
    Date of Patent: June 23, 1992
    Assignee: Rhone-Poulene Nutrition Animale
    Inventor: Jean-Pierre Duchesne
  • Sulpholenes and processes for their preparation and use
    Patent number: 5082953
    Abstract: A sulpholene compound and more particularly 4,4-dimethyl-2,2-dioxo-1,2,4,5,6,7-hexahydro-benzo[c]thiophene. These compounds are prepared by bringing myrcene sulphone into contact with a strong acid. The compounds of the present invention can be used as synthesis intermediates in the preparation of vitamin A.
    Type: Grant
    Filed: March 4, 1991
    Date of Patent: January 21, 1992
    Assignee: Rhone Poulenc Nutrition Animale
    Inventor: Jean-Pierre Duchesne
  • Process for the preparation of diaryl sulphides and diaryl selenides
    Patent number: 5026846
    Abstract: Diaryl sulphides and diaryl selenides of formula:Ar--X--Arwhere X=S or Se and Ar=aryl are made by the action of sulphur and sulphur dioxide or selenium and selenium dioxide on a compound of formula:Ar--HThe process is especially useful for the preparation of phenothiazines of formula ##STR1## in which X=S or Se and Z and Z.sub.1, which may be identical or different, are each hydrogen, halogen, alkyl or alkoxy.
    Type: Grant
    Filed: August 15, 1989
    Date of Patent: June 25, 1991
    Assignee: Rhone-Poulenc Sante
    Inventor: Jean-Pierre Duchesne