Revolutionary phosgene-free synthesis of α-amino acid N-carboxyanhydrides using diphenyl carbonate based on activation of α-amino acids by converting into imidazolium salts
作者:Koichi Koga、Atsushi Sudo、Takeshi Endo
DOI:10.1002/pola.24213
日期:——
α‐Amino acids imidazolium salt smoothly reacted with diphenylcarbonate to afford the corresponding urethanes. The urethanes were activated by adding carboxylic acid to undergo selective cyclization, leading to successful development of a new phosgene‐free process for synthesizing α‐amino acid N‐carboxyanhydrides (NCAs).
α-氨基酸咪唑鎓盐与
碳酸二苯酯平稳反应,生成相应的
氨基甲酸酯。通过添加
羧酸使
氨基甲酸酯活化以进行选择性环化,从而成功开发了一种无
光气的合成
α-氨基酸N-羧基酸酐(NCA)的新方法。