Visible-Light Induced Isoindoles Formation To Trigger Intermolecular Diels–Alder Reactions in the Presence of Air

Visible-light
induced isoindole formation triggered an intermolecular
Diels–Alder reaction with dienophiles such as acetylenedicarboxylate
and maleimides in the presence of air. The reaction resulted in excellent
diastereoselctivity and high yields under mild reaction conditions.
This protocol provides an atom-economical, transition-metal-free (TM-free)
and straightforward approach to structurally diverse bridged-ring
heterocycles from easily accessible molecules.