Patents by Inventor Frederick A. Plagge

Frederick A. Plagge 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).

  • Stereoselective process for producing nitro compounds
    Patent number: 6329536
    Abstract: The present invention relates to producing stereoselective nitro compounds by reacting a dicarbonyl compound with a nitrostyrene compound in the presence of a catalyst complex and a base.
    Type: Grant
    Filed: September 16, 1999
    Date of Patent: December 11, 2001
    Assignee: Abbott Laboratories
    Inventors: Jianguo Ji, David M. Barnes, Steve King, Frederick A. Plagge, Steven J. Wittenberger, Ji Zhang
  • Enantioselective synthesis of 3-aminopyrrolidines
    Patent number: 6211395
    Abstract: The invention relates to a process of preparing a chiral compound of the formula: wherein R1 is selected from the group consisting of hydrogen and lower alkyl, and R2 and R2′ are the same, and R2 and R2′ are selected from a group consisting of hydrogen and primary alkyl, or R2 and R2′ taken together form a C3 to C6 cycloalkyl, comprising the steps of chirally reducing a &bgr;-keto ester to afford a &bgr;-hydroxy ester, activating the &bgr;-hydroxy ester by treatment with a sulfonic acid or a derivative thereof to provide an activated compound having sulfonate leaving group, displacing the sulfonate leaving group with an azido moiety, or treating the activated compound with an alkylamine, deprotecting and cyclizing to afford a pyrrolidinone, and reducing the pyrrolidinone to afford a stereoisomerically preferred 3-aminopyrrolidine derivative.
    Type: Grant
    Filed: June 13, 2000
    Date of Patent: April 3, 2001
    Assignee: Abbott Laboratories
    Inventors: Daniel J. Plata, Steven A. King, Frederick A. Plagge, Anne E. Bailey, Louis Seif
  • Enantioselective synthesis of 3-aminopyrrolidines
    Patent number: 6197974
    Abstract: The invention relates to a process of preparing a chiral compound of the formula: wherein R1 is selected from the group consisting of hydrogen and lower alkyl, and R2 and R2′ are the same, and R2 and R2′ are selected from a group consisting of hydrogen and primary alkyl, or R2 and R2′ taken together form a C3 to C6 cycloalkyl, comprising the steps of chirally reducing a &bgr;-keto ester to afford a &bgr;-hydroxy ester, activating the &bgr;-hydroxy ester by treatment with a sulfonic acid or a derivative thereof to provide an activated compound having sulfonate leaving group, displacing the sulfonate leaving group with an azido moiety, or treating the activated compound with an alkylamine, deprotecting and cyclizing to afford a pyrrolidinone, and reducing the pyrrolidinone to afford a stereoisomerically preferred 3-aminopyrrolidine derivative.
    Type: Grant
    Filed: October 25, 1999
    Date of Patent: March 6, 2001
    Assignee: Abbott Laboratories
    Inventors: Daniel J. Plata, Steven A. King, Frederick A. Plagge, Anne E. Bailey, Louis Seif