Preparation of Lactams from Cyclic Anhydrides <i>via N</i>‐Carboxyanhydride Intermediates
作者:Simon N. Smith、Stephen J. Connon
DOI:10.1002/ejoc.202100751
日期:2021.10.26
Cyclic anhydrides can be readily converted to ring-contracted lactams after sequential silylazidation, protonolysis, Curtius rearrangement and catalysis of ring closure by DMAP, in an operationally simple procedure. Succinic anhydrides do not form ring-contracted β-lactams but instead generate β-N-carboxyanhydrides which serve as activated analogues of β-amino acids of use in β-peptide and polymer
在连续的甲硅烷基叠氮化、质子分解、Curtius 重排和 DMAP 催化闭环后,环酐可以很容易地转化为环缩内酰胺,操作简单。琥珀酸酐不会形成环收缩的 β-内酰胺,而是生成 β- N-羧酸酐,其用作 β-肽和聚合物化学中使用的 β-氨基酸的活化类似物。