Patents by Inventor Markus Tanner

Markus Tanner 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).

  • Diastereoselective process for preparing n-substituted amino acids and derivatives
    Patent number: 5292918
    Abstract: A process for preparing an (S,S) or (R,R) diastereoisomer of the formula: ##STR1## or salts, esters or amides thereof, wherein R.sup.3 and R.sup.4 independently represent hydrogen, alkyl, aryl or aryl substituted with halogen, alkyl, nitro or alkoxy, and n and m independently represent integers from one to six, comprising combining a cyanide compound of the formula:M.sup.1 C.tbd.N (III)wherein M.sup.1 is hydrogen, trimethylsilyl or a metal, with an optional proton source, a solvent and a Lewis acid of the formula:M.sup.2 X.sub.4, AlCl.sub.3 or BF.sub.3 (IV)wherein M.sup.2 is Sn or Ti and X represents chloro, bromo, fluoro or iodo, with an .alpha.-amino acid compound or salts or esters thereof, followed by addition of an acyl or acetal compound to give the diastereoisomer of formula (X).
    Type: Grant
    Filed: October 6, 1992
    Date of Patent: March 8, 1994
    Assignee: Schering Corporation
    Inventors: Jacques Gosteli, Ingrid Mergelsberg, Markus Tanner
  • Tablet
    Patent number: D298061
    Type: Grant
    Filed: December 4, 1985
    Date of Patent: October 11, 1988
    Assignee: Sandoz Ltd.
    Inventors: Urs Flury, Detlef Lenkeit, Markus Tanner, Werner Thommen, Othmar Zuger