The inverse electron demand Diels-Alder cycloaddition employing azadienes has become an important tool for the synthesis of biologically active natural'and unnatural* product^.^ Though the use of indole as a dienophile in both inverse4 and normal5 electron demand cycloadditions has been limited, the number of examples is increasing. We recently reported that indole and several of its simple derivatives undergo a facile inverse electron demand ...
