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US 2003/0120084 A1Published application
Method of producing amino carboxylic acids
AssigneeDegussa AG
InventorsOliver Meyer, Thomas Kalz, Karlheinz Drauz
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Abstract
The present invention is directed to a method for producing amino acids by reacting halogenated carboxylic acid ester (haloacid esters) with a metal cyanate in the presence of an alcohol and by subsequent acidic saponification of the urethane carbonic acid formed. The method is characterized by the metal cyanate being placed at an elevated temperature in an organic solvent and the other reactants being continuously charged into the mixture over a defined time period.
Claims11
A method of producing an amino acid, comprising:
- a) reacting a halogenated carboxylic acid ester with a metal cyanate and an alcohol at a temperature of between 80° C. and 200° C., to produce a urethane carbonic acid, wherein:
- i) said metal cyanate is placed in an aprotic, polar, organic solvent to form a solution;
- ii) said alcohol and halogenated carboxylic acid ester are added to said solution in a continuous manner;
- and
- b) producing said amino acid by acidic saponification of said urethane carbonic acid.
2 more elements
Dependencies are inferred from the claim text.