Unusual Orthogonality in the Cleavage Process of Closely Related Chelating Protecting Groups for Carboxylic Acids by Using Different Metal Ions
作者:Stephan Mundinger、Uwe Jakob、Willi Bannwarth
DOI:10.1002/chem.201302708
日期:2014.1.27
conditions, these protecting groups are also stable under acidic and basic conditions, allowing them to be used in combination with the ester protection of carboxylic acids. The cleavage of these protecting groups is activated by the chelation of metal ions, involving an unusual coordination of the amide nitrogen. Despite their similarity, cleavage of these protecting groups is possible in both a stepwise
已经开发了基于螯合胺的三个结构上相关的羧酸中继保护基。这些保护基可以很容易地通过在2-(1 H-苯并三唑-1-基)-1,1,3,3-四甲基溴化四氟硼酸盐(TBTU)。这些保护基除了对整个反应条件稳定外,在酸性和碱性条件下也稳定,因此可以与羧酸的酯保护剂结合使用。这些保护基的裂解被金属离子的螯合激活,这涉及酰胺氮的异常配位。尽管它们相似,但是通过施加不同的金属盐,可以逐步和正交方式裂解这些保护基。