Water → HCID 12968959, compound

Participants

Reaction Steps

To a mixed solvent of 1750 ml of water and 497 ml of toluene was added 733.7 g (5 mol) of L-glutamine at room temperature. The solution was cooled to 0° to 5° C. and adjusted to pH 11 with 5N sodium hydroxide. To the solution was added dropwise a solution of 565.3 g (5 mol) of chloro-acetyl chloride in 497 ml of toluene while maintaining the pH of the reaction mixture at 11 with 5N sodium hydroxide. After stirring at 0° to 5° C. for 1 hour, toluene was removed from the reaction mixture by liquid-liquid separation. The aqueous layer separated was adjusted to pH 2 by addition of 410 ml of concentrated hydrochloric acid. After seeding, the reaction mixture was subjected to crystallization at room temperature for 1 hour and then at 0° to 5° C. for 3 hours. The resulting crystals were collected by filtration and dried under reduced pressure to give 992.6 g (89.2 mole percent (mol %) yield) of crude N-chloroacetyl-L-glutamine (sodium chloride content: 13.6 weight percent (wt %)). The crystals were analyzed by high performance liquid chromatography (HPLC) (column: Shim-pack CLC-ODS, 6 ×150 mm (manufactured by Shimadzu Corporation); eluent: 0.01M sodium 1-octanesulfonate/0.01M KH2PO4 buffer (pH 2.5)/1% methanol; detection: UV 210 nm). The purity of the crystals was found to be 99.0% as calculated from the HPLC relative area ratio.

Provenance & Evidence