Double Gold-Catalysed Annulation of Indoles by Enynones
作者:Stephen J. Heffernan、James P. Tellam、Marine E. Queru、Andrew C. Silvanus、David Benito、Mary F. Mahon、Alan J. Hennessy、Benjamin I. Andrews、David R. Carbery
DOI:10.1002/adsc.201300018
日期:2013.4.15
The gold‐catalysed double functionalisation of indoles is presented. Enynones are used to annulate indoles via a double sodium tetrachloroaurate‐catalysed process involving a mixture of CH activation and alkyne activation modes of promotion. Good yields for the formation of medicinally relevant [6,5,7]‐tricyclic indoles are realised.
In this paper a unique approach to the synthesis of polycyclic ring systems is disclosed. The approach features an intermolecular Diels-Alderreaction followed by an intramolecular Diels-Alderreaction where the regiochemistry of addition is controlled by substituents on the bisdiene and bisdienophile. This methodology has been applied to the synthesis of the fluorenone ring system. An efficient convergent