Patents by Inventor Joachim Lanz

Joachim Lanz 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).

  • ?3-amino!-tetrahydrocarbazole-propanoic acid esters
    Patent number: 5684158
    Abstract: The invention relates to new ?3-amino!-tetrahydrocarbazole-propanoic acid esters which can be used as intermediates for the preparation of known thromboxane-antagonistic active compounds, and to a method for the purification of these active compounds.
    Type: Grant
    Filed: February 22, 1996
    Date of Patent: November 4, 1997
    Assignee: Bayer Aktiengesellschaft
    Inventors: Samir Samaan, Joachim Lanz, Paul Naab, Ulrich Rosentreter
  • Process for the preparation of 7-amino-3-((Z)-1-propen-1yl)-3-cephem-4-carboxylic acid
    Patent number: 5132419
    Abstract: (7-APCA) having the formula (I) ##STR1## which is an important synthesis intermediate in the preparation of cephalosporin-like antibiotics, is prepared by treating a compound of the formula (II) ##STR2## in which R.sub.1 and R.sub.2 represent alkyl, aryl and aralkyl radicals, with a strong protonic acid or with a Lewis acid. Compound (II) is prepared by adding triphenylphosphine and alkali metal iodide to a compound of the formula (VI) ##STR3## then reacting with acetaldehyde in base. Compound (VI) is prepared by treating a compound of the formula (VII) ##STR4## with a base in a polar solvent at -70.degree. C. to 0.degree. C. Compound (VII) is prepared by treating a compound of the formula (VIII) ##STR5## with a chlorinating agent in an organic solvent.
    Type: Grant
    Filed: September 27, 1990
    Date of Patent: July 21, 1992
    Assignee: Bayer Aktiengesellschaft
    Inventors: Joachim Lanz, Paul Naab, Ulrich Rosentreter