SEARCH Articles Figures Tables 1,3-cycloaddition intramolecular Alder Cycloaddition Cycloaddition reaction intramolecular Cycloaddition reactions Diels-Alder reaction Cycloaddition reactions intramolecular cycloadditions Diels cycloaddition Diels cycloaddition reactions Diels intramolecular Diels intramolecular reaction Diels-Alder cycloaddition Diels-Alder cycloadditions Diels-Alder reaction 2 + 2] cycloaddition Diels-Alder reaction cycloaddition, facilitating intramolecular Diels-Alder reaction indoles intramolecular cycloaddition Intramolecular Diels-Alder Intramolecular Diels-Alder cycloaddition