SEARCH Articles Figures Tables Diels hetero Diels intramolecular Diels intramolecular reaction Hetero Diels-Alder reaction intramolecular Lewis acid Hetero Diels-Alder reaction intramolecular Lewis acid catalysed Hetero intramolecular Hetero-Diels-Alder Hetero-Diels-Alder reaction Hetero-Diels-Alder reaction intramolecular, forming Intramolecular Diels-Alder Intramolecular Hetero and Diels-Alder Reactions Intramolecular hetero-Diels-Alder