Process for producing l-proline

Details Process for producing l-proline Process for producing l-proline

C - Chemistry, Metallurgy

07

D

260/323, 260/325

C07D 207/16 (2006.01) C07D 207/22 (2006.01)

Patent

CA 1176263

ABSTRACT OF THE DISCLOSURE L-proline is produced from the methyl or ethyl ester of the L-pyroglutamic acid which is reacted with at least twice the molar amount of phosgene to form the corresponding 1-chloro- carbonyl-5,5-dichloro-proline ester, the corresponding 2-chloro- 1-chloro-carbonyl-pyroline-(2)-carboxylic ester is produced therefrom by splitting off hydrogen chloride and the latter ester is catalytically hydrogenated to the corresponding N-chloro-carbonyl-proline ester which is then acidically hydrolized to L-proline. The L-proline is obtained in large yields.

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