SEARCH Articles Figures Tables 1,3-cycloaddition intramolecular Cycloaddition stereoselection Imine 2+2] cycloaddition Imines cycloadditions Imines intramolecular Intramolecular cycloadditions stereoselectivity Nitrile imine Nitrile imines cycloaddition Nitrile imines cycloadditions Nitrile imines intramolecular cycloadditions Nitrile stereoselective Nitriles cycloaddition Nitriles cycloadditions Nitriles intramolecular Stereoselective cycloadditions