Patents by Inventor Young S. Lo

Young S. Lo 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: 7282583
    Abstract: An improved process for making 5,11-dihydro-11-ethyl-5-methyl-8-{2-{(1-oxido-4-quinolinyl)oxy}ethyl}-6H-di pyrido[3,2-b:2?,3?-e][1,4]diazepin-6-one.
    Type: Grant
    Filed: November 16, 2006
    Date of Patent: October 16, 2007
    Assignee: Boehringer Ingelheim International GmbH
    Inventors: Saeed Ahmad, Robert Frederick Boswell, Jr., Jack Delbert Brown, Cary Mark Davis, Kai Oliver Donsbach, Bernard Franklin Gupton, Christopher Peter Johnson, III, Ahmad Khodabocus, Vithalanand R. Kulkarni, Young S. Lo
  • Patent number: 6469170
    Abstract: A method for the preparation of oxycodone, and salts thereof, from codeine comprising oxidation of codeine to codeinone, formation of an dienolsilyl ether congener of codeinone in strong amine base, oxidation of the dienolsilyl ether congener using peracetic acid, and hydrogenation of the resulting 14-hydroxycodeinone product.
    Type: Grant
    Filed: May 21, 2002
    Date of Patent: October 22, 2002
    Assignee: Boehringer Ingelheim Chemicals, Inc.
    Inventors: Fang-Ting Chiu, Young S. Lo
  • Publication number: 20020143183
    Abstract: A method for the preparation of oxycodone, and salts thereof, from codeine comprising oxidation of codeine to codeinone, formation of an dienolsilyl ether congener of codeinone in strong amine base, oxidation of the dienolsilyl ether congener using peracetic acid, and hydrogenation of the resulting 14-hydroxycodeinone product.
    Type: Application
    Filed: May 21, 2002
    Publication date: October 3, 2002
    Applicant: Boehringer Ingelheim Chemicals, Inc.
    Inventors: Fang-Ting Chiu, Young S. Lo
  • Patent number: 6403798
    Abstract: A method for the preparation of oxycodone, and salts thereof, from codeine comprising oxidation of codeine to codeinone, formation of an dienolsilyl ether congener of codeinone in strong amine base, oxidation of the dienolsilyl ether congener using peracetic acid, and hydrogenation of the resulting 14-hydroxycodeinone product.
    Type: Grant
    Filed: February 26, 2001
    Date of Patent: June 11, 2002
    Assignee: Boehringer Ingelheim Chemicals, Inc.
    Inventors: Fang-Ting Chiu, Young S. Lo
  • Patent number: 6262266
    Abstract: A method for the preparation of oxycodone, and salts thereof, from codeine comprising oxidation of codeine to codeinone, formation of an dienolsilyl ether congener of codeinone in strong amine base, oxidation of the dienolsilyl ether congener using peracetic acid, and hydrogenation of the resulting 14-hydroxycodeinone product.
    Type: Grant
    Filed: September 22, 2000
    Date of Patent: July 17, 2001
    Assignee: Boehringer Ingelheim Chemicals, Inc.
    Inventors: Fang-Ting Chiu, Young S. Lo
  • Publication number: 20010005754
    Abstract: A method for the preparation of oxycodone, and salts thereof, from codeine comprising oxidation of codeine to codeinone, formation of an dienolsilyl ether congener of codeinone in strong amine base, oxidation of the dienolsilyl ether congener using peracetic acid, and hydrogenation of the resulting 14-hydroxycodeinone product.
    Type: Application
    Filed: February 26, 2001
    Publication date: June 28, 2001
    Inventors: Fang-Ting Chiu, Young S. Lo
  • Patent number: 6177567
    Abstract: A method for the preparation of oxycodone, and salts thereof, from codeine comprising oxidation of codeine to codeinone, formation of an dienolsilyl ether congener of codeinone in strong amine base, oxidation of the dienolsilyl ether congener using peracetic acid, and hydrogenation of the resulting 14-hydroxycodeinone product.
    Type: Grant
    Filed: October 15, 1999
    Date of Patent: January 23, 2001
    Assignee: Boehringer Ingelheim Chemicals, Inc.
    Inventors: Fang-Ting Chiu, Young S. Lo
  • Patent number: 5466797
    Abstract: This invention relates to novel compounds and derivatives thereof containing a trioxepane protected diol in addition to a hydrazone, hydrazine, amine, or cyclic urea moiety; methods for the preparation of said compounds; and the use of said compounds in processes to prepare human immunodeficiency virus (HIV) protease inhibitors which effectively inhibit HIV. The novel compounds provided by this invention have the formulae: ##STR1## wherein the substituents are as defined herein.
    Type: Grant
    Filed: June 30, 1994
    Date of Patent: November 14, 1995
    Assignee: The Du Pont Merck Pharmaceutical Company
    Inventors: Lucius T. Rossano, Young S. Lo
  • Patent number: 5310928
    Abstract: Method for the preparing biphenyltetrazole compounds which are angiotensin II receptor antagonists or which are useful intermediates to prepare angiotensin II receptor antagonists. An illustrative biphenyl tetrazole compound is 2-n-butyl-4-chloro-1-[(2'-(tetrazol-5-yl)-1,1'-biphenyl-4-yl)methyl]-1H-im idazole-5-methanol, potassium salt.
    Type: Grant
    Filed: July 10, 1992
    Date of Patent: May 10, 1994
    Assignees: E. I. Du Pont de Nemours and Company, Merck & Co., Inc.
    Inventors: Young S. Lo, Lucius T. Rossano, Robert D. Larsen, Anthony O. King
  • Patent number: 5273993
    Abstract: Methods of treating chronic arthritis and osteoporosis which utilize both known and novel compounds which would fall under the general formula:(HO)p--A--[--OS(O).sub.2 NR.sup.1 R.sup.2 ].sub.zwherein A encompasses a wide range of values including but not limited to aryl, loweralkyl, cycloalkyl, and carbohydrates including sucrose and fructose; p is equal to the number of unreacted hydroxy groups contained on the molecule and may be zero; z is the number of --OS(O).sub.2 NR.sup.1 R.sup.2 groups and is always at least one; R.sup.1 and R.sup.2 are selected from hydrogen, loweralkyl, carboxy and the like; a novel process for preparing the compounds is provided wherein an appropriate sulfamic acid aryl ester is reacted with a hydroxy substituted A radical which may or may not contain thereon protected carboxyl, amino or hydroxy substituents, in an aprotic solvent containing a tertiary amine base. Pharmaceutical compositions for the treatment of chronic arthritis and osteoporosis are also provided.
    Type: Grant
    Filed: November 19, 1992
    Date of Patent: December 28, 1993
    Assignee: A. H. Robins Company, Incorporated
    Inventors: Young S. Lo, Joseph C. Nolan, William J. Welstead, Jr., David A. Walsh, Dwight A. Shamblee, Ibrahim M. Uwaydah
  • Patent number: 5206374
    Abstract: Method for the preparation of novel tetrazolyphenylboronic acids such as the compound 2-(2'-triphenylmethyl-2'H-tetrazol-5'-yl)phenylboronic acid.
    Type: Grant
    Filed: July 10, 1992
    Date of Patent: April 27, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Young S. Lo
  • Patent number: 5194446
    Abstract: Methods of treating chronic arthritis and osteoporosis which utilize both known and novel compounds which would fall under the general formula:(HO)p--A--[--OS(O).sub.2 NR.sup.1 R.sup.2 ].sub.zwherein A encompasses a wide range of values including but not limited to aryl, loweralkyl, cycloalkyl, and carbohydrates including sucrose and fructose; p is equal to the number of unreacted hydroxy groups contained on the molecule and may be zero; z is the number of --OS(O).sub.2 NR.sup.1 R.sup.2 groups and is always at least one; R.sup.1 and R.sup.2 are selected from hydrogen, loweralkyl, carboxy and the like; a novel process for preparing the compounds is provided wherein an appropriate sulfamic acid aryl ester is reacted with a hydroxy substituted A radical which may or may not contain thereon protected carboxyl, amino or hydroxy substituents, in an aprotic solvent containing a tertiary amine base. Pharmaceutical compositions for the treatment of chronic arthritis and osteoporosis are also provided.
    Type: Grant
    Filed: July 24, 1991
    Date of Patent: March 16, 1993
    Assignee: A. H. Robins Company, Incorporated
    Inventors: Young S. Lo, Joseph C. Nolan, William J. Welstead, Jr., David A. Walsh, Dwight A. Shamblee, Ibrahim M. Uwaydah
  • Patent number: 5192785
    Abstract: Sulfamate esters of the formula(HO).sub.p --A--[OSO.sub.2 NR.sup.1 R.sup.2 ].sub.zwhere A is aryloxyalkyl, p is the number of unreacted hydroxy groups present on the alkyl moiety and may be zero, z is the number of --OS(O).sub.2 NR.sup.1 R.sup.2 groups attached to carbons of the alkyl moiety and is always at least one; R.sup.1 and R.sup.2 are selected from hydrogen, loweralkyl, carboxy, and the like are useful in treating glaucoma.
    Type: Grant
    Filed: June 10, 1991
    Date of Patent: March 9, 1993
    Assignee: A. H. Robins Company, Incorporated
    Inventors: Young S. Lo, Joseph C. Nolan, Dwight A. Shamblee
  • Patent number: 5183903
    Abstract: This invention relates to an improved process for the preparation of 3-phenoxy-1-azetidinecarboxamides of Formula I which are useful ##STR1## in the treatment of epileptic seizures. Under Formula I, n is 1 to 3, X is H, halogen, trifluoromethyl, C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy, acetyl, or aminocarbonyl, and R is H or methyl. This process involves heating a 3-phenoxyazetidine with urea to obtain the Formula I compound. Urea is inexpensive and easily removed by washing the solid Formula I product with water.
    Type: Grant
    Filed: November 26, 1991
    Date of Patent: February 2, 1993
    Assignee: A. H. Robins Company, Incorporated
    Inventors: William J. Welstead, Jr., Young S. Lo
  • Patent number: 5130439
    Abstract: Novel tetrazolylphenylboronic acids, methods for their preparation, and their use in the syntheses of angiotensin II receptor antagonists are disclosed.
    Type: Grant
    Filed: November 18, 1991
    Date of Patent: July 14, 1992
    Inventors: Young S. Lo, Lucius T. Rossano
  • Patent number: 5025031
    Abstract: Herein disclosed is a method of treating convulsions with a pharmaceutical composition containing a compound of the formula:(HO).sub.p --A--[OSO.sub.2 NR.sup.1 R.sup.2 ].sub.zwhere A is an aryl, arylalkyl, or aryloxyalkyl group and is substituted on 1 or more carbon atoms with a sulfamate group (--OSO.sub.2 NR.sup.1 R.sup.2) wherein R.sup.1 and R.sup.2, same or different, are hydrogen or loweralkyl wherein p is 0 or 1 and is the number of untreated hydroxyl groups and z is 1 or 2 and is the number of --OS(O.sub.2)NR.sup.1 R.sup.2 groups. Aryl is selected from phenyl, substituted phenyl, pyridinyl, naphthyl, quinolinyl, and the like. Phenyl substituents are selected from hydrogen, halo, hydroxy, phenyl, phenoxy, benzoyl, loweralkyl, loweralkoxy, carboxy, amino, loweralkylamino, diloweralkylamino, acetamido, cyano, nitro, loweralkoxycarboyl, aminosulfonyl, imidazolyl, triazolyl, and the like. Novel compounds not previously disclosed are also described.
    Type: Grant
    Filed: November 30, 1989
    Date of Patent: June 18, 1991
    Assignee: A. H. Robins Co., Inc.
    Inventors: Young S. Lo, David A. Walsh, Ibrahim M. Uwaydah
  • Patent number: 4990683
    Abstract: A novel process is disclosed for the preparation of 3-pyrrolidinol compounds selected from the group having the formula: ##STR1## wherein: R is selected from hydrogen, loweralkyl, loweralkenyl, cycloalkyl, cycloalkyl-loweralkyl, phenyl-loweralkyl and substituted phenyl-loweralkyl; R.sup.1, R.sup.2, and R.sup.3 are selected from hydrogen, loweralkyl, and loweralkenyl; and the optical isomers thereof. In the process, 4-amino-3-hydroxybutyronitriles are reductively cyclized with Raney nickel to produce the 3-pyrrolidinol compound.
    Type: Grant
    Filed: January 11, 1988
    Date of Patent: February 5, 1991
    Assignee: A. H. Robins Company, Incorporated
    Inventor: Young S. Lo
  • Patent number: 4966979
    Abstract: A novel process is described for preparing azetidine and 2 or 3 methyl and ethyl azetidine free bases by reacting primary arylmethylamine having suitable bulk providing substituents attached to the methyl carbon and an appropriate propane derivative having leaving groups in the one and three position in hot organic solvent containing a non-nucleophilic base and an amount of water sufficient to promote azetidine ring formation to give N-protected-azetidines and deprotecting by hydrogenolysis under acidic conditions to give an acid salt of the azetidines and thereafter flashing off vaporized azetidine from a hot, agitated strong base solution or slurry and condensing to give the liquid azetidine free bases.
    Type: Grant
    Filed: April 24, 1989
    Date of Patent: October 30, 1990
    Assignee: A. H. Robins Company, Incorporated
    Inventors: Young S. Lo, Dwight A. Shamblee, David H. Causey, Richard P. Mays
  • Patent number: 4960896
    Abstract: A process for the preparation of 5-halo-2-hydroxynicotinic acids having the formula: ##STR1## wherein X is chlorine or bromine, Y and Z are selected from hydrogen, loweralkyl or loweralkyl, is described wherein a corresponding 2-hydroxynicotinic acid is halogenated with alkali-metal hypohalite in a strongly alkaline solution pH 12 and above. Certain aspects of the isolation of the product are directed to avoiding replacement of the carboxy group with halogen.
    Type: Grant
    Filed: November 13, 1987
    Date of Patent: October 2, 1990
    Assignee: A. H. Robins Company, Inc.
    Inventor: Young S. Lo
  • Patent number: 4870189
    Abstract: A novel process is described for preparing azetidine and 2 or 3 methyl and ethyl azetidine free bases by reacting primary arylmethylamine having suitable bulk providing substituents attached to the methyl carbon and an appropriate propane derivative having leaving groups in the one and three position in hot organic solvent containing a non-nucleophilic base and an amount of water sufficient to promote azetidine ring formation to give N-protected-azetidines and deprotecting by hydrogenolysis under acidic conditions to give an acid salt of the azetidines and thereafter flashing off vaporized azetidine from a hot, agitated strong base solution or slurry and condensing to give the liquid azetidine free bases.
    Type: Grant
    Filed: January 28, 1987
    Date of Patent: September 26, 1989
    Assignee: A. H. Robins Company, Incorporated
    Inventors: Young S. Lo, Dwight A. Shamblee, David H. Causey, Richard P. Mays