Patents by Inventor Dhileepkumar Krishnamurthy

Dhileepkumar Krishnamurthy 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: 20080214870
    Abstract: This invention provides intermediates useful in a method of preparing amine stereoisomers. It also provides a method of preparing sulfoxide and sulfinylamine stereoisomers using certain of the intermediates.
    Type: Application
    Filed: February 18, 2008
    Publication date: September 4, 2008
    Inventors: Zhengxu Han, Dhileepkumar Krishnamurthy, Chris Hugh Senanayake, Zhi-Hui Lu
  • Patent number: 7332610
    Abstract: This invention provides intermediates useful in a method of preparing amine stereoisomers. It also provides a method of preparing sulfoxide and sulfinylamine stereoisomers using certain of the intermediates.
    Type: Grant
    Filed: September 1, 2006
    Date of Patent: February 19, 2008
    Assignee: Apsinterm LLC
    Inventors: Zhengxu Han, Dhileepkumar Krishnamurthy, Chris Hugh Senanayake, Zhi-Hui Lu
  • Publication number: 20070293682
    Abstract: This invention encompasses novel methods of preparing sulfinamides and sulfoxides, particularly stereomerically pure sulfinamides and sulfoxides. The invention further encompasses novel compounds from which sulfinamides and sulfoxides can be prepared.
    Type: Application
    Filed: July 30, 2007
    Publication date: December 20, 2007
    Inventors: Chris Senanayake, Zhengxu Han, Dhileepkumar Krishnamurthy, Derek Pflum, Harold Wilkinson
  • Patent number: 7256297
    Abstract: This invention encompasses novel methods of preparing sulfinamides and sulfoxides, particularly stereomerically pure sulfinamides and sulfoxides. The invention further encompasses novel compounds from which sulfinamides and sulfoxides can be prepared.
    Type: Grant
    Filed: January 27, 2006
    Date of Patent: August 14, 2007
    Assignee: Apsinterm, LLC.
    Inventors: Chris Hugh Senanayake, Zhengxu Han, Dhileepkumar Krishnamurthy, Derek Pflum, Harold Scott Wilkinson
  • Publication number: 20070173517
    Abstract: Disclosed is an improved multi-step process for preparing a compound of Formula I: wherein R1 to R3 are as defined herein. The compounds of formula I inhibit the binding of human intercellular adhesion molecules to the Leukointegrins. As a result, these compounds are useful in the treatment of inflammatory and immune cell-mediated diseases.
    Type: Application
    Filed: January 16, 2007
    Publication date: July 26, 2007
    Inventors: Thomas WIRTH, Jutta KROEBER, Thomas NICOLA, Armin RAPP, Dieter GUTHEIL, Simone ORLICH, Xiao-jun WANG, Dhileepkumar KRISHNAMURTHY
  • Publication number: 20060287539
    Abstract: This invention provides intermediates useful in a method of preparing amine stereoisomers. It also provides a method of preparing sulfoxide and sulfinylamine stereoisomers using certain of the intermediates.
    Type: Application
    Filed: September 1, 2006
    Publication date: December 21, 2006
    Inventors: Zhengxu Han, Dhileepkumar Krishnamurthy, Chris Hugh Senanayake, Zhi-Hui Lu
  • Publication number: 20060258749
    Abstract: The present invention relates to processes for preparing the compounds of general formula I, wherein the groups R1 and R3 are defined according to claim 1. Furthermore this inventions relates to intermediates obtained in these processes.
    Type: Application
    Filed: May 3, 2006
    Publication date: November 16, 2006
    Applicant: Boehringer Ingelheim International GmbH
    Inventors: Matthias Eckhardt, Frank Himmelsbach, Xiao-jun Wang, Wenjun Tang, Xiufeng Sun, Li Zhang, Dhileepkumar Krishnamurthy, Christopher Senanayake, Zhengxu Han
  • Publication number: 20060258888
    Abstract: Disclosed are methods for making 1,3- and 1,4-diamino-phenyl intermediates by utilizing bis-amination of ortho-substituted aryl halides.
    Type: Application
    Filed: May 1, 2006
    Publication date: November 16, 2006
    Applicant: Boehringer Ingelheim International, GmbH
    Inventors: Rogelio Frutos, Isabelle Gallou, Dhileepkumar Krishnamurthy, Xiufeng Sun
  • Patent number: 7129378
    Abstract: This invention provides a method of preparing amine stereoisomers, which comprises stereoselectively reducing a sulfinylimine that bears on the sulfinyl group a residue of an alcohol, thiol or amine, or reacting a sulfinylimine stereoisomer that bears on the sulfinyl group a residue of an alcohol, thiol or amine with a source of a nucleophile, to afford a sulfinylamine stereoisomer, followed by contacting the sulfinylamine stereoisomer with a reagent suitable for the cleavage of a sulfur-nitrogen bond, to afford an amine stereoisomer. It also provides novel intermediates useful in the method, and the use of certain of the intermediates in the preparation of sulfoxide and sulfinylamine stereoisomers.
    Type: Grant
    Filed: April 7, 2003
    Date of Patent: October 31, 2006
    Assignee: Apsinterm, LLC
    Inventors: Zhengxu Han, Dhileepkumar Krishnamurthy, Chris Hugh Senanayake, Zhi-Hui Lu
  • Patent number: 7064214
    Abstract: This invention encompasses novel methods of preparing sulfinamides and sulfoxides, particularly stereomerically pure sulfinamides and sulfoxides. The invention further encompasses novel compounds from which sulfinamides and sulfoxides can be prepared.
    Type: Grant
    Filed: April 12, 2002
    Date of Patent: June 20, 2006
    Assignee: Apsinterm LLC
    Inventors: Chris Hugh Senanayake, Zhengxu Han, Dhileepkumar Krishnamurthy, Derek Pflum, Harold Scott Wilkinson
  • Publication number: 20060128767
    Abstract: This invention encompasses novel methods of preparing sulfinamides and sulfoxides, particularly stereomerically pure sulfinamides and sulfoxides. The invention further encompasses novel compounds from which sulfinamides and sulfoxides can be prepared.
    Type: Application
    Filed: January 27, 2006
    Publication date: June 15, 2006
    Inventors: Chris Senanayake, Zhengxu Han, Dhileepkumar Krishnamurthy, Derek Pflum, Harold Wilkinson
  • Patent number: 6974838
    Abstract: Methods of making and using racemic and optically pure metabolites of sibutramine, and pharmaceutically acceptable salts, solvates, and clathrates thereof, are disclosed. Pharmaceutical compositions and dosage forms are also disclosed which comprise a dopamine reuptake inhibitor, such as a racemic or optically pure sibutramine metabolite, and optionally an additional pharmacologically active compound.
    Type: Grant
    Filed: March 23, 2004
    Date of Patent: December 13, 2005
    Assignee: Sepracor Inc.
    Inventors: Chrisantha Hugh Senanayake, Qun Kevin Fang, Zhengxu Han, Dhileepkumar Krishnamurthy
  • Publication number: 20050165240
    Abstract: This invention provides a method of preparing amine stereoisomers, which comprises stereoselectively reducing a sulfinylimine that bears on the sulfinyl group a residue of an alcohol, thiol or amine, or reacting a sulfinylimine stereoisomer that bears on the sulfinyl group a residue of an alcohol, thiol or amine with a source of a nucleophile, to afford a sulfinylamine stereoisomer, followed by contacting the sulfinylamine stereoisomer with a reagent suitable for the cleavage of a sulfur-nitrogen bond, to afford an amine stereoisomer. It also provides novel intermediates useful in the method, and the use of certain of the intermediates in the preparation of sulfoxide and sulfinylamine stereoisomers.
    Type: Application
    Filed: April 7, 2003
    Publication date: July 28, 2005
    Inventors: Zhengxu Han, Dhileepkumar Krishnamurthy, Chris Senanayake, Zhi-Hui Lu
  • Patent number: 6894189
    Abstract: This invention encompasses novel methods of preparing sibutramine and sibutramine derivatives, and stereomerically pure sibutramine derivatives in particular. Examples of sibutramine derivatives include, but are not limited to, sibutramine metabolites such as desmethylsibutramine and didesmethylsibutramine. The invention further encompasses novel compounds useful in the synthesis of sibutramine derivatives.
    Type: Grant
    Filed: August 20, 2003
    Date of Patent: May 17, 2005
    Assignee: Sepracor Inc.
    Inventors: Chris Hugh Senanayake, Zhengxu Han, Dhileepkumar Krishnamurthy, Derek Pflum
  • Publication number: 20040180857
    Abstract: Methods of making and using racemic and optically pure metabolites of sibutramine, and pharmaceutically acceptable salts, solvates, and clathrates thereof, are disclosed. Pharmaceutical compositions and dosage forms are also disclosed which comprise a dopamine reuptake inhibitor, such as a racemic or optically pure sibutramine metabolite, and optionally an additional pharmacologically active compound.
    Type: Application
    Filed: March 23, 2004
    Publication date: September 16, 2004
    Inventors: Chrisantha Hugh Senanayake, Qun Kevin Fang, Zhengxu Han, Dhileepkumar Krishnamurthy
  • Publication number: 20040087660
    Abstract: This invention encompasses novel methods of preparing sibutramine and sibutramine derivatives, and stereomerically pure sibutramine derivatives in particular. Examples of sibutramine derivatives include, but are not limited to, sibutramine metabolites such as desmethylsibutramine and didesmethylsibutramine. The invention further encompasses novel compounds useful in the synthesis of sibutramine derivatives.
    Type: Application
    Filed: August 20, 2003
    Publication date: May 6, 2004
    Applicant: Sepracor Inc.
    Inventors: Chris Hugh Senanayake, Zhengxu Han, Dhileepkumar Krishnamurthy, Derek Pflum
  • Patent number: 6710087
    Abstract: Methods of making and using racemic and optically pure metabolites of sibutramine, and pharmaceutically acceptable salts, solvates, and clathrates thereof, are disclosed. Pharmaceutical compositions and dosage forms are also disclosed which comprise a dopamine reuptake inhibitor, such as a racemic or optically pure sibutramine metabolite, and optionally an additional pharmacologically active compound.
    Type: Grant
    Filed: June 4, 2002
    Date of Patent: March 23, 2004
    Assignee: Sepracor, Inc.
    Inventors: Chrisantha Hugh Senanayake, Qun Kevin Fang, Zhengxu Han, Dhileepkumar Krishnamurthy
  • Patent number: 6610887
    Abstract: This invention encompasses novel methods of preparing sibutramine and sibutramine derivatives, and stereomerically pure sibutramine derivatives in particular. Examples of sibutramine derivatives include, but are not limited to, sibutramine metabolites such as desmethylsibutramine and didesmethylsibutramine. The invention further encompasses novel compounds useful in the synthesis of sibutramine derivatives.
    Type: Grant
    Filed: April 12, 2002
    Date of Patent: August 26, 2003
    Assignee: Sepracor Inc.
    Inventors: Chris Hugh Senanayake, Zhengxu Han, Dhileepkumar Krishnamurthy, Derek Pflum
  • Publication number: 20030083517
    Abstract: This invention encompasses novel methods of preparing sulfinamides and sulfoxides, particularly stereomerically pure sulfinamides and sulfoxides. The invention further encompasses novel compounds from which sulfinamides and sulfoxides can be prepared.
    Type: Application
    Filed: April 12, 2002
    Publication date: May 1, 2003
    Inventors: Chris Hugh Senanayake, Zhengxu Han, Dhileepkumar Krishnamurthy, Derek Pflum, Harold Scott Wilkinson
  • Publication number: 20020183554
    Abstract: This invention encompasses novel methods of preparing sibutramine and sibutramine derivatives, and stereomerically pure sibutramine derivatives in particular. Examples of sibutramine derivatives include, but are not limited to, sibutramine metabolites such as desmethylsibutramine and didesmethylsibutramine. The invention further encompasses novel compounds useful in the synthesis of sibutramine derivatives.
    Type: Application
    Filed: April 12, 2002
    Publication date: December 5, 2002
    Inventors: Chris Hugh Senanayake, Zhengxu Han, Dhileepkumar Krishnamurthy, Derek Pflum