SEARCH Articles Figures Tables Diastereoselective reaction Diastereoselective reactions Diastereoselectivity Diastereoselective synthesis Diastereoselectivity reaction Diels diastereoselective Diels hetero Diels-Alder reaction diastereoselectivity Diels-Alder synthesis Hetero diastereoselective Hetero-Diels-Alder Hetero-Diels-Alder reaction Synthesis Diels-Alder reaction Synthesis diastereoselectivity