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