A novel approach to indoloditerpenes by Nazarov photocyclization: synthesis and biological investigations of terpendole E analogues.

The application of the Nazarov photocyclization as a mild and efficient method for access to the basic core of novel indoloditerpenoid derivatives is reported. The detailed synthesis of these new analogues of terpendole E, as well as their evaluation as potential inhibitors of KSP, is described.