SEARCH Articles Figures Tables 3- indole, Diels-Alder Diels-Alder reaction 3- indoles Diels-Alder reaction 3- indoles Diels-Alder reaction indoles intramolecular cycloaddition Diels-Alder reactions of indoles Heteroyohimboid indole alkaloids via Diels-Alder reactions Indole reactions Indoles reactions