SEARCH Articles Figures Tables 1,3-cycloaddition intramolecular Cycloaddition enantioselective Enantioselectivity 2+2] cycloadditions Intramolecular cycloaddition synthesis Intramolecular enantioselective Intramolecular enantioselective synthesis Intramolecular enantioselectivity SYNTHESIS intramolecular Synthesis cycloaddition Synthesis enantioselective