Patents by Inventor Hui-Yin Li

Hui-Yin Li 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: 6399784
    Abstract: The present invention relates to processes for the conversion of nitrites to amidines in the preparation of compounds which are antagonists of the platelet glycoprotein IIb/IIIa fibrinogen receptor complex. The compounds described herein are potent thrombolytics and useful for the inhibition of platelet aggregation in the treatment of thromboembolic disorders.
    Type: Grant
    Filed: January 10, 2001
    Date of Patent: June 4, 2002
    Assignee: Bristol-Myers Squibb Pharma Company
    Inventors: Philip Ma, Pasquale N. Confalone, Hui-Yin Li
  • Publication number: 20020061917
    Abstract: The present invention relates to the process for the preparation of the compound of Formula I: 1
    Type: Application
    Filed: September 21, 2001
    Publication date: May 23, 2002
    Inventors: Hui-Yin Li, Luigi Anzalone, Fuqiang Jin, David J. Meloni, Jung-Hui Sun, Christopher A. Teleha, Jia C. Zhou, Thomas E. Smyser
  • Publication number: 20020055641
    Abstract: A novel process for making 1,3,5-trisubstituted pyrazoles of the type shown below from appropriate phenyl hydrazines is described.
    Type: Application
    Filed: December 3, 2001
    Publication date: May 9, 2002
    Inventors: Jiacheng Zhou, Lynette May Oh, Pasquale N. Confalone, Hui-Yin Li, Philip Ma
  • Patent number: 6329527
    Abstract: A novel process for making 1,3,5-trisubstituted pyrazoles of the type shown below from appropriate phenyl hydrazines is described. These compounds are useful as factor Xa inhibitors.
    Type: Grant
    Filed: October 10, 2000
    Date of Patent: December 11, 2001
    Assignee: Bristol-Myers Squibb Pharma Company
    Inventors: Jiacheng Zhou, Lynette May Oh, Pasquale N. Confalone, Hui-yin Li, Philip Ma
  • Publication number: 20010008886
    Abstract: The present invention relates to processes for the conversion of nitrites to amidines in the preparation of compounds which are antagonists of the platelet glycoprotein IIb/IIIa fibrinogen receptor complex. The compounds described herein are potent thrombolytics and useful for the inhibition of platelet aggregation in the treatment of thromboembolic disorders.
    Type: Application
    Filed: January 10, 2001
    Publication date: July 19, 2001
    Inventors: Philip Ma, Pasquale N. Confalone, Hui-Yin Li
  • Patent number: 6245914
    Abstract: The present invention relates to processes for the conversion of nitrites to amidines in the preparation of compounds which are antagonists of the platelet glycoprotein IIb/IIIa fibrinogen receptor complex. The compounds described herein are potent thrombolytics and useful for the inhibition of platelet aggregation in the treatment of thromboembolic disorders.
    Type: Grant
    Filed: July 1, 1999
    Date of Patent: June 12, 2001
    Assignee: DuPont Pharmaceuticals Company
    Inventors: Philip Ma, Pasquale N. Confalone, Hui-Yin Li
  • Patent number: 6194569
    Abstract: Processes for the preparation of [S-(R,S)]-N-[1,3-benzodioxol-5-yl)butyl]-3,3-diethyl-2[4-[4-methyl-1-piperazinyl)carbonyl]phenoxy]-4-oxo-l-azetidine carboxamide, a useful inhibitor of human leukocyte elastase (HLE), are described. The process including (a) contacting a compound of formula (II): with a compound of formula (III): in a first polar solvent system in the presence of an aqueous base and a phase transfer catalyst, to form the title compound, or a salt form thereof.
    Type: Grant
    Filed: August 30, 1999
    Date of Patent: February 27, 2001
    Assignee: DuPont Pharmaceuticals Company
    Inventors: Patrick J. Sheeran, Luigi Anzalone, Hui-Yin Li, Joseph M. Fortunak, Louis Storace
  • Patent number: 5962693
    Abstract: The present invention relates to processes for the conversion of nitrites to amidines in the preparation of compounds which are antagonists of the platelet glycoprotein IIb/IIIa fibrinogen receptor complex. The compounds described herein are potent thrombolytics and useful for the inhibition of platelet aggregation in the treatment of thromboembolic disorders.
    Type: Grant
    Filed: October 5, 1998
    Date of Patent: October 5, 1999
    Assignee: DuPont Pharmaceuticals Company
    Inventors: Philip Ma, Pasquale N. Confalone, Hui-Yin Li
  • Patent number: 5932749
    Abstract: Processes for the preparation of R-.alpha.-propyl-piperonyl amine and its analogs, such compounds being useful intermediates in the preparation of elastase inhibitors, and intermediates useful for making R-.alpha.-propyl-piperonyl amine are described.
    Type: Grant
    Filed: March 21, 1997
    Date of Patent: August 3, 1999
    Assignee: DuPont Pharmaceuticals Company
    Inventors: Hui-Yin Li, Luigi Anzalone, Robert Eugene Waltermire
  • Patent number: 5856525
    Abstract: The present invention provides a novel process for making compounds of formula 2a or 2b or pharmaceutically acceptable salts thereof, ##STR1## wherein R.sub.1 is selected from the group consisting of phenyl and phenyl substituted with at least one group selected from NO.sub.2 and halogen;R.sub.2 is H;R.sub.3 is selected from the group consisting of C.sub.1-4 alkyl, phenyl, and benzyl; and,R.sub.4 is selected from the group consisting of H and halogen;which comprises the steps of:a) oxidizing a racemate of formula 2 or a salt thereof to form a dehydro-compound of formula 3, ##STR2## wherein R.sub.5 is selected from the group consisting of H, CH.sub.3, benzyl, C.sub.2-8 acyl Na, Li and K; and,b) asymmetrically hydrogenating a compound of formula 3 in the presence of a chiral phosphine catalyst to form a compound of formula 2a or 2b.
    Type: Grant
    Filed: October 14, 1997
    Date of Patent: January 5, 1999
    Assignee: DuPont Pharmaceuticals Company
    Inventors: Hui-Yin Li, Andrea Jane Robinson
  • Patent number: 5686631
    Abstract: The present invention provides a novel process for making compounds of formula 2a or 2b or pharmaceutically acceptable salts thereof, ##STR1## wherein R1 is selected from the group consisting of phenyl and phenyl substituted with at least one group selected from NO.sub.2 and halogen;R.sub.2 is H;R.sub.3 is selected from the group consisting of C.sub.1-4 alkyl, phenyl, and benzyl; and,R.sub.4 is selected from the group consisting of H and halogen;which comprises the steps of:a) oxidizing a racemate of formula 2 or a salt thereof to form a dehydro-compound of formula 3, ##STR2## wherein R.sub.5 is selected from the group consisting of H, CH.sub.3, benzyl, C.sub.2-8 acyl Na, Li and K; and,b) asymmetrically hydrogenating a compound of formula 3 in the presence of a chiral phosphine catalyst to form a compound of formula 2a or 2b.
    Type: Grant
    Filed: July 11, 1996
    Date of Patent: November 11, 1997
    Assignee: The DuPont Merck Pharmaceutical Company
    Inventors: Hui-Yin Li, Andrea Jane Robinson
  • Patent number: 5583147
    Abstract: This invention provides amide compounds as inhibitors of acyl-Coenzyme A: cholesterol O-acyltransferase (ACAT), pharmaceutical compositions containing such compounds, processes for the preparation of such compounds, and the use of such compounds as antihypercholesterolemic and/or antiatherosclerotic agents.
    Type: Grant
    Filed: March 23, 1994
    Date of Patent: December 10, 1996
    Assignee: The Dupont Merck Pharmaceutical Company
    Inventors: Soo S. Ko, Richard G. Wilde, Indawati DeLucca, Hui-Yin Li, Hollis S. Kezar, III, George A. Boswell, Anurag S. Srivastava