The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 12, 1996
Filed:
Sep. 15, 1994
Albert Loffet, Paris, FR;
Jean-Alain Fehrentz, Saint Nazaire de Pezan, FR;
Jean Martinez, Saussan, FR;
Philippe-Francois Winternitz, Montpellier, FR;
Propeptide, Vert le Petit, FR;
Abstract
The invention relates to a process for the preparation of 5-(1-hydroxy-2-urethanethylidene)-2,2-dimethyl-1,3-dioxane-4,6-dione derivatives, which are precursors of chiral tetramic acid derivatives. According to this process, an N-urethane-protected .alpha.-amino acid N-carboxy-anhydride is reacted with Meldrum's acid in an inert organic solvent medium in the presence of a tertiary amine. This process makes it possible to conserve the chirality of the starting material and in particular to simplify the synthesis of 4-amino-3-hydroxy acids and the derivatives thereof via the tetramic acid route.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile