Method of preparing alkali metal salts of 2-pyrrolidone-5-carbox

Details Method of preparing alkali metal salts of 2-pyrrolidone-5-carbox Method of preparing alkali metal salts of 2-pyrrolidone-5-carbox

1988-10-17

1990-08-07

Brust, Joseph Paul

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D20728

Patent

active

049469681

ABSTRACT:
Alkali metal salts of 2-pyrrolidone-5-carboxylic acid (pyroglutamic acid) are prepared by heating the corresponding alkali metal salt of glutamic acid to a temperature between its melting point and 270.degree. C. until the water liberated by the intramolecular condensation (cyclocondensation) has been completely eliminated.

REFERENCES:
patent: 3235563 (1966-02-01), Noyori et al.
patent: 3243440 (1966-03-01), Noyori et al.
Lichtenstein; "Preparation of .gamma.-Alkylamides of Glutamic Acid"; JACS 64; pp. 1021-1022 (May 1942).
Moeller, Inorganic Chemistry; 1976, John Wiley & Sons.
L. E. Arnow and J. C. Opsahl, "Racemization of Glutamic Acid with Heat", Journal of Biological Chemistry, vol. 134, pp. 649 (1940).

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