METHOD FOR PRODUCING N-HYDROCARBON OXYCARBONYLAMINO ACID

Japanese Patent JP2001114744

A

To provide a method for producing an N-hydrocarbon oxycarbonylamino acid, capable of obtaining a high-purity N-hydrocarbon oxycarbonylamino acid by a simple operation without passing through a complicated purification process and yet readily reusing a solvent.

This method for producing the N-hydrocarbon oxycarbonylamino acid comprises reacting an amino acid salt whose aqueous solution shows basicity with a dicarbonate compound in a mixed solution of a water-soluble organic solvent and water to give a reaction solution containing the salt of the N- hydrocarbon oxycarbonylamino acid as the objective substance, an alcohol and an N-hydrocarbon oxycarbonylamino acid ester as reaction by-products, removing the alcohol and the water-soluble organic solvent from the reaction solution, then extracting and removing the N-hydrocarbon oxycarbonylamino acid ester by using a water-insoluble organic solvent from the aqueous solution from which the alcohol and the water-soluble organic solvent are removed and bringing the aqueous solution containing the salt of the objective substance into contact with an acid.

JP2629375	INDUSTRIAL APPLICABILITY: A method for producing a dopa or a dopa derivative in which an amino group is protected.
JPH0662543	[Title of Invention] Method for Producing Aromatic Urethane
JPH05201953	PRODUCTION OF BIS-(ETHOXYCARBONYL-AMINO)-TOLUENE AND PROCESS FOR PRODUCING DIISOCYANATETOLUENE THEREFROM

SHIIKI TAKAFUMI
HIROTA YOSHIHIRO
TANAKA KENJI

JP29508699A

April 24, 2001

October 18, 1999

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TOKUYAMA CORP

C07C269/04; C07C271/22; (IPC1-7): C07C269/04; C07C271/22

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