Benzoylureas as removable cisamide inducers: synthesis of cyclic amidesviaring closing metathesis (RCM)
作者:Ryan M. Brady、Yelena Khakham、Guillaume Lessene、Jonathan B. Baell
DOI:10.1039/c0ob00723d
日期:——
Rapid and high yielding synthesis of medium ring lactams was made possible through the use of a benzoylurea auxiliary that serves to stabilize a cisoidamide conformation, facilitating cyclization. The auxiliary is released after activation under the mild conditions required to deprotect a primary amine, such as acidolysis of a Boc group in the examples given here. This methodology is a promising tool for the synthesis of medium ring lactams, macrocyclic natural products and peptides.
通过使用苯甲酰脲辅助剂,可以实现中环内酰胺的快速高产合成,该辅助剂用于稳定顺氨基酰胺构象,从而促进环化。在温和条件下对初级胺去保护时,该辅助剂会被释放,例如在这里给出的例子中通过Boc基团的酸解。这种方法对于中环内酰胺、宏环天然产物和肽的合成是一种有前途的工具。