Synthesis of 3-aminochromenes: the Zincke reaction revisited
作者:Marta Costa、Ana I. Rodrigues、Fernanda Proença
DOI:10.1016/j.tet.2014.05.074
日期:2014.8
3-Aminocoumarines and 2-iminochromen-3-amines were efficiently prepared from the Zincke-ring-opening reaction of the corresponding 2H-chromen-3-pyridinium chlorides using N-methylpiperazine. This methodology unravels the marked potential of pyridinium salts as protective groups for primary amines. These scaffolds can be considered important building blocks for new novobiocin analogues and heterocyclic