Privileged indole-fused phenanthridinones were synthesized by an inexpensive potassium
tert-butoxide-promoted intramolecular Mizoroki–Heck-type radical cyclization. This method
offers high atom- and step-economic C–C bond formation. An array of the synthesized
compounds showed good photoluminescence properties, and could be successfully applied
as fluorescent bioprobes for imaging of living cancer cells.
Key words
transition-metal-free reaction - C–H bond functionalization - potassium
tert-butoxide - Mizoroki–Heck reaction - phenanthridinones - indoles