Improved Auxiliary for the Synthesis of Medium-Sized Bis(lactams)
作者:Jasper Springer、T. Paul Jansen、Steen Ingemann、Henk Hiemstra、Jan H. van Maarseveen
DOI:10.1002/ejoc.200700832
日期:2008.1
Our auxiliary-based method for the synthesis of bis(lactams) has been optimized. A novel auxiliary is described that is inserted in the backbone of a linear peptide facilitating the mutually reactive terminal groups to approach one another for a cyclization reaction. A subsequent ring contraction mechanism leads to the bis(lactams) with the remainings of the auxiliary still attached. Functionalized seven-