Patents by Inventor Urs O. Hengartner

Urs O. Hengartner 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 bicyclic diketones
    Patent number: 4495354
    Abstract: The preparation of bicyclic diketones of the formula ##STR1## wherein R.sub.1 is lower alkyl or ar-lower alkyl from a compound of the formula ##STR2## wherein R.sub.1 is as previously described or a salt thereof, and a di-lower alkyl malonate is described. The reactants are combined in a reaction sequence consisting of Michael addition, cyclization, hydrolysis, and decarboxylation. The preparation of the compounds of formula II is also described.
    Type: Grant
    Filed: March 29, 1982
    Date of Patent: January 22, 1985
    Assignee: Hoffmann-La Roche Inc.
    Inventors: David L. Coffen, Urs O. Hengartner
  • Pyrroles and pyrrolidines
    Patent number: 4316847
    Abstract: The preparation of racemic and optically pure tryptophans is described. The D-enantiomers of the 6-substituted compounds possess a potent sweetening capability. Novel intermediates are also disclosed.
    Type: Grant
    Filed: October 22, 1980
    Date of Patent: February 23, 1982
    Assignee: Hoffmann-La Roche Inc.
    Inventors: Andrew D. Batcho, Urs O. Hengartner, Willy Leimgruber, John W. Scott, Donald Valentine, Jr.
  • Novel syntheses of tryptophans
    Patent number: 4256641
    Abstract: The preparation of racemic and optically pure tryptophans is described. The D-enantiomers of the 6-substituted compounds possess a potent sweetening capability. Novel intermediates are also disclosed.
    Type: Grant
    Filed: July 30, 1979
    Date of Patent: March 17, 1981
    Assignee: Hoffmann-La Roche Inc.
    Inventors: Andrew D. Batcho, Urs O. Hengartner, Willy Leimgruber, John W. Scott, Donald Valentine, Jr.
  • Lower alkyl esters of .alpha.-formamido,.alpha.-carbalkoxy tryptophans
    Patent number: 4140697
    Abstract: Lower alkyl esters of 2-formamido-3(4,5,6 or 7-methyl substituted-3-indolyl)-2-carbalkoxy propionic acid which are useful as intermediates for tryptophane sweetners.
    Type: Grant
    Filed: November 9, 1977
    Date of Patent: February 20, 1979
    Assignee: Hoffmann-La Roche Inc.
    Inventors: Andrew D. Batcho, Urs O. Hengartner, Willy Leimgruber, John W. Scott, Donald Valentine, Jr.