| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a method for efficiently removing contaminating impurities. SOLUTION: This method for producing an N-protected S-phenylcysteine comprises adding an organic solvent selected from aromatic hydrocarbons, organic esters and halogen-based hydrocarbons to an alkaline reactional liquid of S-phenylcycteine having a protecting group introduced into amino group thereof in an aqueous medium, extracting a soluble substance, then separating an aqueous solution layer, regulating the pH of the aqueous solution to an acidic one, adding an organic solvent selected from the aromatic hydrocarbons, organic esters and halogen-based hydrocarbons to the acidic aqueous solution and extracting the resultant N-protected S-phenylcysteine on the side of the solvent.</p> |
