Patents by Inventor Dominique Gibert

Dominique Gibert 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 carboxamide oximes
    Patent number: 6020498
    Abstract: The invention relates to a process for preparing carboxamide oximes of the formula (I): in which R.sup.1 represents an aryl or heteroaromatic group, and R.sup.2 and R.sup.3 represent a hydrogen atom or groups as defined in the description, characterized by the three following steps:1) An amide of the formula (II) R.sup.1 CONHR.sup.4, with R.sup.1 having the previous meaning and R.sup.4 being a C.sub.1 to C.sub.8 alkyl group, is reacted with a chlorinating agent in order to obtain the corresponding chloroimine,2) The resulting chloroimine is then caused to react with an aminopyrazole in order to obtain a novel disubstituted amidine,3) The resulting amidine is caused to react with hydroxylamine or one of its salts.Carboxamide oximes are prepared more rapidly, and in a good yield, in this way. They are useful as synthesis intermediates, in particular for preparing photographic developing agents.
    Type: Grant
    Filed: July 22, 1999
    Date of Patent: February 1, 2000
    Assignee: ISOCHEM
    Inventors: Laurence Ferruccio, Dominique Gibert, Guyselaine Vergne
  • Pyranone, process for its preparation, its use in the preparation of a new pyridinone and a process for the preparation of same
    Patent number: 5292885
    Abstract: 2,3,5-(4H)-Trimethyl pyranone having the formula: ##STR1## which is prepared by acetylation of a ketone derived from 2-formyl-3-pentanone and preparation of 2,3,5-(1H)-trimethyl 4-pyridinone having the formula: ##STR2## by ammonolysis of the 2,3,5-(4H)-trimethyl 4-pyranone.
    Type: Grant
    Filed: August 13, 1990
    Date of Patent: March 8, 1994
    Assignee: Isochem
    Inventors: Didier G. Wirth, Dominique Gibert, Laurence Ferrucio
  • Method relating to preparation of aspartyl peptides
    Patent number: 4761495
    Abstract: The present invention is directed to a composition and method relating to the preparation of aspartyl peptides having the general formula: ##STR1## where the radical-NHR represents an amino acid or peptide group. In the method, a .beta.-monoester of aspartic acid having the general formula: ##STR2## where R.sub.1 represents a hydrocarbon-containing radical, is reacted with a .beta.-dicarbonyl compound, preferably ethylacetoacetate to protect the aspartyl amino group and form an enamine. The enamine is then coupld to an amino acid or peptide, following which any protecting groups are removed to yield .alpha.-aspartyl peptides without any .beta.-isomer. In its composition aspects, the present invention is directed to novel enamines resulting from reaction of the .beta.-monoester of aspartic acid with a .beta.-dicarbonyl compound.
    Type: Grant
    Filed: January 11, 1985
    Date of Patent: August 2, 1988
    Assignee: Isochem S.A.
    Inventors: Didier Wirth, Dominique Gibert, Annie Boutin