Patents by Inventor Boyapati M. Choudary

Boyapati M. Choudary 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).

  • Process for preparing diltiazem using a heterogeneous trifunctional catalyst
    Patent number: 6881839
    Abstract: The present invention comprises a simplified synthesis of (+)-diltiazem through IE-PdOsW wherein IE is ion-exchanger, catalyzed three-component coupling reaction and Fe3+-exchanged clay catalyzed ring opening of sulfite with 2-aminothiophenol followed by cyclization as key steps.
    Type: Grant
    Filed: December 31, 2002
    Date of Patent: April 19, 2005
    Assignee: Council of Scientific and Industrial Research
    Inventors: Boyapati M. Choudary, Naidu S. Chowdari, Sateesh Madhi, Lakshmi K. Mannepalli
  • Process for preparing diltiazem using a heterogeneous trifunctional catalyst
    Publication number: 20040127704
    Abstract: The present invention comprises a simplified synthesis of (+)-diltiazem through IE-PdOsW wherein IE is ion-exchanger, catalyzed three-component coupling reaction and Fe3+-exchanged clay catalyzed ring opening of sulfite with 2-aminothiophenol followed by cyclization as key steps.
    Type: Application
    Filed: December 31, 2002
    Publication date: July 1, 2004
    Applicant: COUNCIL OF SCIENTIFIC AND INDUSTRIAL RESEARCH
    Inventors: Boyapati M. Choudary, Naidu S. Chowdari, Sateesh Madhi, Lakshmi K. Mannepalli
  • Process for preparing taxol side chain using heterogeneous trifunctional catalyst
    Patent number: 6706901
    Abstract: The present invention relates to an improved process for the preparation of taxol side chain by synthesizing (2R,3S)-2,3-dihydroxy-3-phenylpropionate with greater than 99% enantioselectivity and devoid of osmium even in crude form in a single pot using a recyclable multifunctional catalysts, conversion of diol obtained without further crystallization into bromoacetate, reaction of bromoacetate with NaN3 in organic solvent followed by deacetylation with to obtain azido alcohol, benzoylation followed by hydrogenation of azido alcohol to obtain the (2R,3S)-(N-)-benzoyl-3-phenylisoserine methyl ester in 67% yield.
    Type: Grant
    Filed: December 31, 2002
    Date of Patent: March 16, 2004
    Assignee: Council of Scientific and Industrial Research
    Inventors: Boyapati M. Choudary, Naidu S. Chowdari, Sateesh Madhi, Lakshmi K. Mannepalli, Jyothi Karangula
  • Process for the preparation of supported osmates
    Patent number: 6703531
    Abstract: The present invention discloses a process for the preparation of a novel heterogeneous osmate catalyst of the general formula (S—NR3)2OsO4.nH2O wherein S is a support, R is an alkyl group, n is the number of water molecules by reacting potassium osmate with supported quaternary ammonium species in an aqueous solvent.
    Type: Grant
    Filed: February 14, 2003
    Date of Patent: March 9, 2004
    Assignee: Council of Scientific and Industrial Research
    Inventors: Boyapati M. Choudary, Naidu S. Chowdari, Mannepalli L. Kantam, Kondapuram V. Raghavan
  • Process for the preparation of supported osmates
    Publication number: 20030153794
    Abstract: The present invention discloses a process for the preparation of a novel heterogeneous osmate catalyst of the general formula (S—NR3)2OsO4.nH2O wherein S is a support, R is an alkyl group, n is the number of water molecules by reacting potassium osmate with supported quaternary ammonium species in an aqueous solvent.
    Type: Application
    Filed: February 14, 2003
    Publication date: August 14, 2003
    Applicant: COUNCIL OF SCIENTIFIC AND INDUSTRIAL RESEARCH.
    Inventors: Boyapati M. Choudary, Naidu S. Chowdari, Mannepalli L. Kantam, Kondapuram V. Raghavan
  • Process for the preparation of supported osmates
    Patent number: 6552234
    Abstract: The present invention discloses a process for the preparation of a novel heterogeneous osmate catalyst of the general formula (S—NR3)2OsO4.nH2O wherein S is a support, R is an alkyl group, n is the number of water molecules by reacting potassium osmate with supported quaternary ammonium species in an aqueous solvent.
    Type: Grant
    Filed: October 23, 2001
    Date of Patent: April 22, 2003
    Assignee: Council of Scientific and Industrial Research
    Inventors: Boyapati M. Choudary, Naidu S. Chowdari, Mannepalli L. Kantam, Kondapuram V. Raghavan
  • Process for the preparation of amine oxides
    Patent number: 6455735
    Abstract: The present invention provides a process for the preparation of high quality amine oxide by reacting a tertiary or secondary amine with hydrogen peroxide as an oxidant in presence of a recyclable heterogeneous layered double hydroxide exchanged with one of the anions of transition metal oxides as a catalyst in a solvent selected from the group consisting of water, water containing dodecylbenzenesulfonic acid sodium salt as additive, and a water miscible organic solvent.
    Type: Grant
    Filed: September 27, 2001
    Date of Patent: September 24, 2002
    Assignee: Council of Scientific and Industrial Research
    Inventors: Boyapati M. Choudary, Balagam Bharathi, Mannepalli L. Kantam, Chinta R. V. Reddy, Kondapuram V. Raghavan
  • Process for the preparation of amine oxides
    Publication number: 20020095055
    Abstract: The present invention provides a process for the preparation of high quality amine oxide by reacting a tertiary or secondary amine with hydrogen peroxide as an oxidant in presence of a recyclable heterogeneous layered double hydroxide exchanged with one of the anions of transition metal oxides as a catalyst in a solvent selected from the group consisting of water, water containing dodecylbenzenesulfonic acid sodium salt as additive, and a water miscible organic solvent.
    Type: Application
    Filed: September 27, 2001
    Publication date: July 18, 2002
    Inventors: Boyapati M. Choudary, Balagam Bharathi, Mannepalli L. Kantam, Chinta R.V. Reddy, Kondapuram V. Raghavan