1 ,3-Dipolarcycloaddition 4 azomethine ylide 4 chemical structure 4 cycloaddition 4 ketone derivative 4 pyrrolidine derivative 4 synthesis 4 1 ,3-dipolar cycloadditions 2 3 formylpyridine 2 Amino acids 2 Article 2 Azomethine ylides 2 Bicyclic systems 2 Bridged Bicyclo Compounds 2 Carbonyl groups 2 Cycloaddition 2 Cycloaddition Reaction 2 Cycloaddition reaction 2 Diastereo-selectivity 2 Dipolar cycloadditions 2 Enantiomers 2 Enzyme Inhibitors 2 Glycoside Hydrolases 2 Hydrolysis 2 Ketones 2 Models, Molecular 2 Molecular Conformation 2 Natural amino acids 2 No inhibitory activities 2 Optimized conditions 2