SEARCH Articles Figures Tables 1,3-cycloaddition intramolecular Alder Cycloaddition Diels cycloaddition Diels intramolecular Diels-Alder cycloaddition Diels-Alder cycloadditions Intramolecular Diels-Alder Intramolecular Diels-Alder cycloaddition Intramolecular stereospecific Stereospecific Diels-Alder