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