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With sodium chloride; potassium carbonate; In water;
Reference Example 2-23 Synthesis of (2S)-2-amino-4-[(4-chlorobenzyl)thio]butanol (Reference Compound No. 2-23): 40.1 g (0.4 mol) of potassium carbonate was added to an anhydrous dimethylformamide solution containing 23.4 g (0.1 mol) of t-butoxycarbonyl-L-aspartic acid. The above prepared mixture was stirred at room temperature for 2 hours, and then 31.1 ml (0.5 mol) of methyl iodide was added dropwise thereto. The reaction mixture was further stirred overnight and water was then added thereto, followed by the extraction with ethyl acetate. The resultant organic extract layer was washed with 1 N hydrochloric acid, a saturated aqueous solution of sodium chloride, and dried over anhydrous sodium sulfate. The solvent was concentrated under reduced pressure, whereby 25.8 g of L-t-butoxycarbonylaspartic acid dimethyl ester was obtained in a yield of 99%.