DBU-promoted tandem Michael-addition/cyclization for the synthesis of polysubstituted pyrroles
作者:Tianyu Yang、Ke-Hu Wang、Danfeng Huang、Pengfei Li、Zhoubin Deng、Yinpeng Su、Yulai Hu
DOI:10.1016/j.tet.2019.02.057
日期:2019.4
An efficient and transition-metal-free method for the synthesis of the structurally diversified pyrroles is described. Various α,β-unsaturated ynones reacted with N-substituted ethyl glycine ethyl ester hydrochlorides in the presence of DBU to form the corresponding products in good yields. This protocol has the advantages of readily available starting materials, mild reaction conditions and a wide