ChemInform Abstract: Anionic (4 + 2) Cycloaddition Reactions of Indole-2,3-dienolate with Dienophiles: A Facile Regiospecific Route to Substituted Carbazoles

Indole 2,3-dienolate derived by deprotonation of 1,2-dimethylindole-3-carboxaldehyde is shown to be useful 1,4-dipole synthon (anionic indolo-2,3-quinodimethane) which undergoes facile cycloaddition with wide range of dienophiles affording substituted carbazoles in highly regiospecific fashion.