The Diels−Alder Reactions of Quinone Imine Ketals:  A Versatile Synthesis of Highly Substituted 5-Methoxyindoles

N-Benzoylated quinone imine ketals undergo smooth cycloadditions in a [4 + 2] sense to yield the expected cycloadducts. The crude cycloadducts, when subjected to a short series of simple transformations, produce synthetically useful quantities of 5-methoxyindoles in excellent overall yields.