Synthesis of 2,3-Ring Fused Pyrroles via Cu-Catalyzed 5-<i>exo</i>-dig Annulation of Alkyne-Tethered Enaminones
作者:Weishuang Li、Muhammad Usman、Lin-Yang Wu、Wen-Bo Liu
DOI:10.1021/acs.joc.9b02672
日期:2019.12.6
A copper-catalyzed annulation of alkyne-tethered enaminones for the synthesis of 2,3-ring fused pyrroles is reported. The 5-exo-dig cyclization/olefin migration reaction delivers the multisubstituted pyrroles in 59-99% yields with 16 examples. This strategy features easily available starting materials, mild reaction conditions, and a cheap ligand-free copper catalyst. The atom-economic transformation