Cycloaddition reactions of carbodiimides. The first example of an intramolecular Diels–Alder reaction of CC-conjugated carbodiimides

Abstract
An one-pot preparation of α-carbolines and quinindolines from conjugated carbodiimides based on a tandem Intramolecular Diels–Alder cycloaddition/oxidative aromatization is described.