Atroposelective [5+5] formation of Benzo[c]chromenone and Phenanthridinone by Carbene organocatalysis

The N-heterocyclic carbene organocatalyzed δ-LUMO activation strategy was used for the atroposelective [5+5] construction of benzo[c]chromenone and phenanthridinone. The cascades involved a regioselective and stereoselective 1,6-addition, an intramolecular aldol reaction,...