Brønsted Acid-promoted Facile Synthesis of N-Fused Angular Imidazoquinolines
Bronsted acid promoted straightforward synthesis of N-fused tricyclic angular imidazoquinolines is developed in high yields through a succinct 1,3-hydride shift. The protocol is operationally simple, scalable, and features broad scope. Photophysical study revealed that these π-extended imidazoquinolines display large Stokes shifts (up to 158 nm) and high fluorescent quantum yields.