A Tandem 1,3-H-Shift–6π-Electrocyclization–Cyclic 2-Amido-diene Intramolecular Diels–Alder Cycloaddition Approach to BCD-Ring of Atropurpuran

Abstract

An approach toward the BCD-ring of atropurpuran via a sequence of allenic 1,3-H shift, 6π-electron pericyclic ring closure, and intramolecular Diels–Alder cycloaddition of cyclic 2-amidodiene is described