Patents by Inventor Suhan Tang

Suhan Tang 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).

  • Preparation of pharmaceutical salts
    Patent number: 7534884
    Abstract: In one embodiment, the present invention discloses a process to directly prepare an unequal ratio of rotamers of an acid salt from a basic compound, by creative choice of a solvent medium. The process is particularly useful in preparing specific rotamers of pharmaceutically useful salts in desired preponderance.
    Type: Grant
    Filed: March 30, 2005
    Date of Patent: May 19, 2009
    Assignee: Schering Corporation
    Inventors: Dinesh Gala, Andrew J. Goodman, Gary Lee, Hongbiao Liao, Martin L. Schwartz, Suhan Tang, David J. S. Tsai, Wenxue Wu
  • Synthesis of quinoline 5-carboxamides useful for the preparation of PDE IV inhibitors
    Patent number: 7129357
    Abstract: In one embodiment, the present application discloses a process for making the compound of the formula:
    Type: Grant
    Filed: September 13, 2004
    Date of Patent: October 31, 2006
    Assignee: Schering Corporation
    Inventors: David R. Andrews, Suhan Tang, Wenxue Wu, Sami Y. Kalliney, Anantha Sudhakar, Christopher Nielsen
  • 1-deoxy taxol analogs
    Patent number: 7019150
    Abstract: 1-Deoxybaccatin III, 1-deoxytaxol and 1-deoxy taxol analogs and method for the preparation thereof.
    Type: Grant
    Filed: August 7, 2003
    Date of Patent: March 28, 2006
    Assignee: Florida State University
    Inventors: Robert A. Holton, Suhan Tang, Feng Liang, Carmen Somoza
  • Synthesis of piperidine and piperazine compounds as CCR5 antagonists
    Patent number: 6992189
    Abstract: In its several embodiments, this invention discloses novel processes to prepare the compounds of formula II and formula IV:
    Type: Grant
    Filed: March 27, 2003
    Date of Patent: January 31, 2006
    Assignee: Schering Corporation
    Inventors: William Leong, Minzhang Chen, Bosco A. D'sa, Man Zhu, Tong Xiao, Xiongwei Shi, Suhan Tang, Dinesh Gala, Andrew J. Goodman, Christopher M. Nielsen, Gary M. Lee, Juan A. Gamboa, Andrew D. Jones
  • Preparation of salts of 4-[4-[(1R)-[4-(trifluoromethyl)phenyl]-2-methoxyethyl]-(3S)-methyl-1-piperazinyl]-4-methyl-1-[(4,6-dimethyl-5-pyrimidinyl)carbonyl]
    Patent number: 6943251
    Abstract: In one embodiment, the present invention discloses a process to directly prepare an unequal ratio of rotamers of an acid salt from a basic compound, by creative choice of a solvent medium. The process is particularly useful in preparing specific rotamers of pharmaceutically useful salts in desired preponderance.
    Type: Grant
    Filed: November 26, 2002
    Date of Patent: September 13, 2005
    Assignee: Schering Corporation
    Inventors: Dinesh Gala, Andrew J. Goodman, Gary Lee, Hongbiao Liao, Martin L. Schwartz, Suhan Tang, David Js Tsai, Wenxue Wu
  • Preparation of rotamer mixtures of pharmaceutical salts
    Patent number: 6936718
    Abstract: In one embodiment, the present invention discloses a process to directly prepare an unequal ratio of specific, preferred rotamer or rotameric pair of an acid salt from a basic compound, by creative choice of a solvent medium. The process is particularly useful in preparing desired rotamers of pharmaceutically useful salts.
    Type: Grant
    Filed: November 26, 2002
    Date of Patent: August 30, 2005
    Assignee: Schering Corporation
    Inventors: Minzhang Chen, Bosco D'sa, William Leong, Suhan Tang
  • Synthesis of piperidine and piperazine compounds as CCR5 antagonists
    Publication number: 20050187248
    Abstract: In its several embodiments, this invention discloses novel processes to prepare the compounds of formula II and formula IV:
    Type: Application
    Filed: March 24, 2005
    Publication date: August 25, 2005
    Inventors: William Leong, Minzhang Chen, Bosco D'sa, Man Zhu, Tong Xiao, Xiongwei Shi, Suhan Tang, Dinesh Gala, Andrew Goodman, Christopher Nielsen, Gary Lee, Juan Gamboa, Andrew Jones
  • Preparation of pharmaceutical salts
    Publication number: 20050171117
    Abstract: In one embodiment, the present invention discloses a process to directly prepare an unequal ratio of rotamers of an acid salt from a basic compound, by creative choice of a solvent medium. The process is particularly useful in preparing specific rotamers of pharmaceutically useful salts in desired preponderance.
    Type: Application
    Filed: March 30, 2005
    Publication date: August 4, 2005
    Inventors: Dinesh Gala, Andrew Goodman, Gary Lee, Hongbiao Liao, Martin Schwartz, Suhan Tang, David Tsai, Wenxue Wu
  • Synthesis of quinoline 5-carboxamides useful for the preparation of PDE IV inhibitors
    Publication number: 20050124655
    Abstract: In one embodiment, the present application discloses a process for making the compound of the formula:
    Type: Application
    Filed: September 13, 2004
    Publication date: June 9, 2005
    Inventors: David Andrews, Suhan Tang, Wenxue Wu, Sami Kalliney, Anantha Sudhakar, Christopher Nielsen
  • Synthesis of 4-[(Z)-4-bromophenyl)(ethoxyimino) methyl]-1'-[(2,4-dimethyl-1-oxido-3-pyridinyl)carbony)]-4'-methyl-1,4-?bipiperidine
    Patent number: 6818773
    Abstract: In one embodiment, the present invention describes the synthesis of 4-[(Z)-(4-bromophenyl)(ethoxyimino)methyl]-1′-[(2,4-dimethyl-1-oxido-3-pyridinyl)carbonyl]-4′-methyl-1,4′-bipiperidine, and intermediates therefor from easily available starting materials by a simple route.
    Type: Grant
    Filed: October 11, 2002
    Date of Patent: November 16, 2004
    Assignee: Schering Corporation
    Inventors: Minzhang Chen, Bosco Anthony D'Sa, William W. Leong, Tong Gan, George S. K. Wong, Suhan Tang, Christopher Michael Nielsen
  • 1- Deoxy baccatin III, 1-deoxy taxol and 1-deoxy taxol analogs and method for the preparation thereof
    Publication number: 20040029976
    Abstract: 1-Deoxybaccatin III, 1-deoxytaxol and 1-deoxy taxol analogs and method for the preparation thereof.
    Type: Application
    Filed: August 7, 2003
    Publication date: February 12, 2004
    Applicant: Florida State University
    Inventors: Robert A. Holton, Suhan Tang, Feng Liang, Carmen Somoza
  • Synthesis of piperidine and piperazine compounds as CCR5 antagonists
    Publication number: 20040024217
    Abstract: In its several embodiments, this invention discloses novel processes to prepare the compounds of formula II and formula IV: 1
    Type: Application
    Filed: March 27, 2003
    Publication date: February 5, 2004
    Applicant: Schering Corporation
    Inventors: William Leong, Minzhang Chen, Bosco A. D'sa, Man Zhu, Tong Xiao, Xiongwei Shi, Suhan Tang, Dinesh Gala, Andrew J. Goodman, Christopher M. Nielsen, Gary M. Lee, Juan A. Gamboa, Andrew D. Jones
  • Method for the preparation of 1-deoxy baccatin III, 1-deoxy taxol and 1-deoxy taxol analogs
    Patent number: 6620950
    Abstract: 1-Deoxybaccatin III, 1-deoxytaxol and 1-deoxy taxol analogs and method for the preparation thereof.
    Type: Grant
    Filed: September 6, 2002
    Date of Patent: September 16, 2003
    Assignee: Florida State University
    Inventors: Robert A. Holton, Suhan Tang, Feng Liang, Carmen Somoza
  • Preparation of pharmaceutical salts
    Publication number: 20030144510
    Abstract: In one embodiment, the present invention discloses a process to directly prepare an unequal ratio of rotamers of an acid salt from a basic compound, by creative choice of a solvent medium. The process is particularly useful in preparing specific rotamers of pharmaceutically useful salts in desired preponderance.
    Type: Application
    Filed: November 26, 2002
    Publication date: July 31, 2003
    Applicant: Schering Corporation
    Inventors: Dinesh Gala, Andrew J. Goodman, Gary Lee, Hongbiao Liao, Martin L. Schwartz, Suhan Tang, David Js Tsai, Wenxue Wu
  • Preparation of pharmaceutical salts
    Publication number: 20030139446
    Abstract: In one embodiment, the present invention discloses a process to directly prepare an unequal ratio of specific, preferred rotamer or rotameric pair of an acid salt from a basic compound, by creative choice of a solvent medium. The process is particularly useful in preparing desired rotamers of pharmaceutically useful salts.
    Type: Application
    Filed: November 26, 2002
    Publication date: July 24, 2003
    Applicant: Schering Corporation
    Inventors: Minzhang Chen, Bosco D'sa, William Leong, Suhan Tang
  • Synthesis of 4-[(Z)-4-bromophenyl)(ethoxyimino) methyl]-1'-[(2,4-dimethyl-1-oxido-3-pyridinyl)carbonyl]-4'-methyl-1,4-'bipiperidine
    Publication number: 20030105131
    Abstract: In one embodiment, the present invention describes the synthesis of 4-[(Z)-(4-bromophenyl)(ethoxyimino)methyl]-1′-[(2,4-dimethyl-1-oxido-3-pyridinyl)carbonyl]-4′-methyl-1,4′-bipiperidine, and intermediates therefor from easily available starting materials by a simple route.
    Type: Application
    Filed: October 11, 2002
    Publication date: June 5, 2003
    Applicant: SCHERING CORPORATION
    Inventors: Minzhang Chen, Bosco Anthony D'Sa, William W. Leong, Tong Gan, George S.K. Wong, Suhan Tang, Christopher Michael Nielsen
  • 1-deoxy baccatin III, 1-deoxy taxol and 1-deoxy taxol analogs and method for the preparation thereof
    Patent number: 6545168
    Abstract: 1-Deoxybaccatin III, 1-deoxytaxol and 1-deoxy taxol analogs and method for the preparation thereof.
    Type: Grant
    Filed: May 5, 1997
    Date of Patent: April 8, 2003
    Assignee: Florida State University
    Inventors: Robert A. Holton, Suhan Tang, Feng Liang, Carmen Somoza
  • Method for the preparation of 1-deoxy baccatin III, 1-deoxy taxol and 1-deoxy taxol analogs
    Publication number: 20030028039
    Abstract: 1-Deoxybaccatin III, 1-deoxytaxol and 1-deoxy taxol analogs and method for the preparation thereof.
    Type: Application
    Filed: September 6, 2002
    Publication date: February 6, 2003
    Applicant: Florida State University
    Inventors: Robert A. Holton, Suhan Tang, Feng Liang, Carmen Somoza
  • Optically active intermediates for the preparation of optically active substituted oximes, hydrazones and olefins useful as neurokinin antagonists
    Patent number: 6265614
    Abstract: Intermediates having the formula wherein BI is —CH2OH or —CH2ORP, and RP is an alcohol protecting group; a is 1, 2, or 3; TI is —OH or QI is phenyl, naphthyl ohr heteroaryl having 1-3 substituents; Ra and Rc are the same, and are H, or are selected from alkyl, cycloalkyl and aryl groups, the groups being optionally substituted with one or more substituents selected from alkyl cycloalkyl, aryl, or —OH; or Ra and Rc together with the C—N—C chain to which they are bound, form a 5-7 membered ring; Rb and Rd are the same, and are H, or are selected from alkyl, cycloalkyl and aryl groups, the groups being optionally substituted with one or more substituents selected from alkyl, cycloalkyl, aryl, or —OH; and D is a directing group capable of directing lithiation alpha to a nitrogen atom of a nitrogen compound having D as a substituent bound to the nitrogen atom when the nitrogen compound is reacted with s-butyl lithium, are disclosed
    Type: Grant
    Filed: October 13, 2000
    Date of Patent: July 24, 2001
    Assignee: Schering Corporation
    Inventors: Anantha R. Sudhakar, Suhan Tang