Patents by Inventor Donald E. Kuhla

Donald E. Kuhla 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: 4080339
    Abstract: 7-Substituted imidazo[2,1-b]thiazolium and 9-substitutedthiazolo[3,2-a]benzimidazolium salts as blood-sugar lowering agents and growth promotants.
    Type: Grant
    Filed: January 12, 1977
    Date of Patent: March 21, 1978
    Assignee: Pfizer Inc.
    Inventors: Richard M. Acheson, John K. Stubbs, Charles A. R. Baxter, Donald E. Kuhla
  • Patent number: 4044015
    Abstract: The synthesis of imidazo[1,2-a]pyridinium, imidazo[1,5-a]pyridinium, pyrrolo[1,2-a]pyrazinium, pyrazolo[1,5-a]pyridinium, imidazo[2,1-a]isoquinolinium and imidazo[5,1-a]isoquinolinium quaternary salts and their use as hypoglycemic agents.
    Type: Grant
    Filed: August 6, 1976
    Date of Patent: August 23, 1977
    Assignee: Pfizer Inc.
    Inventor: Donald E. Kuhla
  • Patent number: 4042583
    Abstract: 7-Substituted imidazo[2,1-b]thiazolium and 9-substitutedthiazolo[3,2-a]benzimidazolium salts as blood-sugar lowering agents and growth promotants.
    Type: Grant
    Filed: June 9, 1976
    Date of Patent: August 16, 1977
    Assignee: Pfizer Inc.
    Inventors: Richard M. Acheson, John K. Stubbs, Charles A. R. Baxter, Donald E. Kuhla
  • Patent number: 4008245
    Abstract: 7-Substituted imidazo[2,1-b]thiazolium and 9-substituted thiazolo-[3,2-a]benzimidazolium salts as blood-sugar lowering agents and growth promotants.
    Type: Grant
    Filed: July 8, 1975
    Date of Patent: February 15, 1977
    Assignee: Pfizer Inc.
    Inventors: Richard M. Acheson, John K. Stubbs, Charles A. R. Baxter, Donald E. Kuhla
  • Patent number: 4006142
    Abstract: The novel process for the preparation of methyl 3-(2-quinoxalinylmethylene)carbazate N.sup.1, N.sup.4 -dioxide which comprises contacting methyl 3-(2-quinoxalinylmethylene)carbazate with oxidizing agent in reaction-inert solvent at a temperature of from about 20.degree. up to 100.degree. C. until reaction is substantially complete, said oxidizing agent being selected from the group consisting of peracetic acid, perbenzoic acid, m-chloroperbenzoic acid, perphthalic acid, performic acid, trifluoroperacetic acid and hydrogen peroxide.
    Type: Grant
    Filed: July 18, 1975
    Date of Patent: February 1, 1977
    Assignee: Pfizer Inc.
    Inventor: Donald E. Kuhla
  • Patent number: 3992394
    Abstract: 6-AMINO AND 6-(N-protected amino)-2,2-dimethyl-3-cyanopenams, intermediates therefor, and a process for the conversion of the 3-cyano penams, by reaction with a source of azide ion in a reaction inert solvent, to 6-amino- and 6-(N-protected amino)-2,2-dimethyl-3(5-tetrazolyl)penams, intermediates for the preparation of antibacterial agents.
    Type: Grant
    Filed: September 5, 1974
    Date of Patent: November 16, 1976
    Assignee: Pfizer Inc.
    Inventor: Donald E. Kuhla
  • Patent number: 3992388
    Abstract: Disclosed herein is an improved process for the preparation of known hypoglycemic piperidinesulfamylureas of the structue ##SPC1##Wherein R is selected from the group consisting of 3-(2-methoxy)pyridyl, 3-(2-ethoxy)pyridyl and 2-(4-chloro)pyridyl and R' is selected from the group consisting of bicyclo[2.2.1]hept-5-en-2-yl-endo-methyl, bicyclo[2.2.1]hept-2-yl-endo-methyl, 7-oxabicyclo[2.2.1]hept-2-yl-methyl, 1-adamantyl and cycloalkyl having from five to eight carbon atoms.Said process comprises contacting 4-(2-pyridyl-amidoethyl) piperidine of the structue ##SPC2##With substantially one equivalent of sulfamide thereby exclusively sulfonating the piperidine nitrogen atom.
    Type: Grant
    Filed: October 17, 1975
    Date of Patent: November 16, 1976
    Assignee: Pfizer Inc.
    Inventors: Wayne E. Barth, Donald E. Kuhla
  • Patent number: 3987172
    Abstract: A series of novel 1-piperidinesulfonylurea compounds derived from a nitrogen-containing monocarboxylic acid have been prepared by reacting an appropriate sulfamide with an organic isocyanate or a trisubstituted urea equivalent thereof. The sulfamylureas so obtained are useful in therapy as oral hypoglycemic agents. Typical members include those compounds derived from 2-methoxynicotinic acid, of which 1-(bicyclo[2.2.1]hept-5-en-2-yl-endo-methyl)-3-{4-[2-(2-methoxynicotinamid o)ethyl]-1-piperidinesulfonyl}-urea is a most preferred embodiment.
    Type: Grant
    Filed: July 25, 1975
    Date of Patent: October 19, 1976
    Assignee: Pfizer Inc.
    Inventors: George R. Evanega, Donald E. Kuhla, Reinhard Sarges
  • Patent number: 3961065
    Abstract: Certain novel benzenesulfonylurea compounds derived from a nitrogen-containing carboxylic acid have been prepared by reacting an appropriate sulfonamide with an organic isocyanate or a tri-substituted urea equivalent thereof. The sulfonylureas so obtained are useful in therapy as oral hypoglycemic agents. Typical members include those compounds derived from 2-methoxy-nicotinic acid, of which 1-cyclohexyl-3-{4-[2-(5-bromo-2-methoxynicotinamido)ethyl]benzenesulfonyl} urea is a most preferred embodiment.
    Type: Grant
    Filed: January 30, 1975
    Date of Patent: June 1, 1976
    Assignee: Pfizer Inc.
    Inventors: Donald E. Kuhla, Reinhard Sarges
  • Patent number: 3961067
    Abstract: Several benzenesulfonylurea compounds derived from 4-methyl-5-thiazolecarboxylic acid have been prepared by reacting 4-[2-(4-methyl-5-thiazolecarboxamido)ethyl]benzenesulfonamide with an appropriate organic isocyanate or a trisubstituted urea equivalent thereof. The sulfonylureas so obtained are useful in therapy as oral hypoglycemic agents. 1-Cyclohexyl-3-{4-[2-(4-methyl-5-thiazolecarboxamido)ethyl]benzenesulfonyl }urea represents a preferred embodiment.
    Type: Grant
    Filed: October 21, 1974
    Date of Patent: June 1, 1976
    Assignee: Pfizer Inc.
    Inventors: Donald E. Kuhla, Reinhard Sarges, Hans E. Wiedermann
  • Patent number: 3954784
    Abstract: 7-Substituted imidazo[2,1-b]thiazolium and 9-substitutedthiazolo-[3,2-a]benzimidazolium salts as blood-sugar lowering agents and growth promotants.
    Type: Grant
    Filed: September 19, 1974
    Date of Patent: May 4, 1976
    Assignee: Pfizer Inc.
    Inventors: Richard M. Acheson, John K. Stubbs, Charles A. R. Baxter, Donald E. Kuhla
  • Patent number: 3944524
    Abstract: A series of novel 1-piperidinesulfonylurea compounds derived from a nitrogen-containing monocarboxylic acid have been prepared by reacting an appropriate sulfamide with an organic isocyanate or a trisubstituted urea equivalent thereof. The sulfamylureas so obtained are useful in therapy as oral hypoglycemic agents. Typical members include those compounds derived from 2-methoxynicotinic acid, of which 1-(bicyclo[2.2.1]hept-5-en-2-yl-endomethyl)-3-{4-[2-(2-methoxynicotinamido )ethyl]-1-piperidinesulfonyl}urea is a most preferred embodiment.
    Type: Grant
    Filed: January 28, 1975
    Date of Patent: March 16, 1976
    Assignee: Pfizer Inc.
    Inventors: George R. Evanega, Donald E. Kuhla, Reinhard Sarges
  • Patent number: 3933830
    Abstract: Disclosed herein is an improved process for the preparation of known hypoglycemic piperidinesulfamylureas of the structure ##EQU1## wherein R is selected from the group consisting of 3-(2-methoxy)pyridyl, 3-(2-ethoxy)pyridyl and 2-(4-chloro)pyridyl and R' is selected from the group consisting of bicyclo[2.2.1]hept-5-en-2-yl-endo-methyl, bicyclo[2.2.1]hept-2-yl-endo-methyl, 7-oxabicyclo[2.2.1]hept-2-yl-methyl, 1-adamantyl and cycloalkyl having from five to eight carbon atoms.Said process comprises contacting 4-(2-pyridyl-amidoethyl) piperidine of the structure ##EQU2## with substantially one equivalent of sulfamide thereby exclusively sulfonating the piperidine nitrogen atom.
    Type: Grant
    Filed: September 10, 1974
    Date of Patent: January 20, 1976
    Assignee: Pfizer Inc.
    Inventors: Wayne E. Barth, Donald E. Kuhla