Novel intramolecular aza-Diels–Alder reaction: a facile synthesis of trans-fused 5H-chromeno[2,3-c]acridine derivatives

A novel series of 5H-chromeno[2,3-c]acridine derivatives has been prepared through the intramolecular aza-Diels–Alder reaction of alkene-tethered chromene-3-carboxaldehyde with various aromatic amines. This is the first example of the preparation of pentacyclic poly aromatic compounds in a single-step operation at ambient temperature.