The 1H-azocino[5,4-b]indole skeleton of the lundurines has been prepared by the 8-endo-dig cyclization of an alkynylindole using AuCl3 or other gold complexes as catalysts.
![Synthesis of the tetracyclic core skeleton of the lundurines by a gold-catalyzed cyclization](https://www.iciq.org/wp-content/uploads/2014/03/Synthesis-of-the-tetracyclic_9015.jpg)
The 1H-azocino[5,4-b]indole skeleton of the lundurines has been prepared by the 8-endo-dig cyclization of an alkynylindole using AuCl3 or other gold complexes as catalysts.