The problem to be solved by the present invention is to ea sily and efficiently produce an amino acid having 2 to 7 carbon atoms as a high-purity solid without complicated operation, whic h is useful as a synthetic intermediate for medicines or agroche micals.
The present invention is characterized in comprising a ste p of precipitating solid amino acid with high purity. In the pr esent invention, the by-produced salt composed of the sulfonic a cid and the amine was removed to the mother liquor by reacting a n amine with a sulfonic acid salt of amino acid in an aprotic pol ar solvent, or by reacting a sulfonic acid with an amine salt of amino acid in an aprotic polar solvent.
The sulfonic acid salt of amino acid, for example, may be produced by reacting a N-(tert-butoxycarbonyl) amino acid with a sulfonic acid, or by reacting an amino acid tert-butyl ester we th a sulfonic acid.
本发明要解决的问题是在不进行复杂操作的情况下,轻松高效地生产出一种具有 2 至 7 个碳原子的高纯度固体
氨基酸,该
氨基酸可用作药物或农用
化学品的合成中间体。
本发明的特征在于包括一种沉淀高纯度固体
氨基酸的方法。在本发明中,通过使胺与
氨基酸的
磺酸盐在非沸腾极性溶剂中反应,或使
磺酸与
氨基酸的胺盐在非沸腾极性溶剂中反应,将由
磺酸和胺组成的副产盐除去到母液中。
例如,
氨基酸的
磺酸盐可通过 N-(叔丁氧羰基)
氨基酸与
磺酸反应,或通过
氨基酸叔丁酯与
磺酸反应制得。