Copper(II)-Catalyzed [4+1] Annulation of Propargylamines with<i>N</i>,<i>O</i>-Acetals: Entry to the Synthesis of Polysubstituted Pyrrole Derivatives
作者:Norio Sakai、Hiroaki Hori、Yohei Ogiwara
DOI:10.1002/ejoc.201500098
日期:2015.3
Described herein is the CuCl2-catalyzed [4+1] annulation of a variety of propargylamines with N,O-acetals that function as a C1 unit, leading to the production of polysubstitutedpyrrolederivatives. Three important features of the N,O-acetal during the [4+1] annulation series via 5-endo-dig cyclization are described: an enolizable substituent adjacent to the central sp3-carbon is required, the central