In the present invention, an N-protected amino acid is obtained by producing an amino acid using a biocatalyst such as a microorganism and enzyme; acidizing the reaction mixture containing the amino acid to adjust pH to not more than 4, without isolating the amino acid; and then protecting the amino group under a basic condition. As a result, a high-quality N-protected amino acid can be quantitatively and efficiently produced using a quantitative or slightly excessive protecting agent, even when the amino acid produced using a biocatalyst is directly protected without isolating the amino acid.
在本发明中,通过使用微
生物和酶等
生物催化剂生产
氨基酸;将含有
氨基酸的反应混合物酸化以调节 pH 值不超过 4,而不分离
氨基酸;然后在碱性条件下保护
氨基,即可获得 N-保护
氨基酸。因此,即使使用
生物催化剂生产的
氨基酸是在不分离
氨基酸的情况下直接保护的,使用定量或略微过量的保护剂也能定量、高效地生产出高质量的 N-保护
氨基酸。